Most locks give you months of warning before they fail, and almost nobody notices. Here is what the warning actually looks like, what it usually means, and how to tell the difference between a lock that is dying and a door that has simply moved. If the difference between a lock that is dying and a door that has moved has become urgent since you started reading, go to locksmith near me.
Locks are mechanical parts, and like any mechanical part they eventually wear out. But knowing when to repair versus replace saves you money and hassle. Here are the signs a Randburg locksmith looks for when deciding.
1. The key feels 'sloppy' in the cylinder
If the key wiggles side-to-side more than a few degrees, the internal pins are worn. A rebuild is possible but usually not cost-effective — replacement wins.
2. You need to jiggle to open
That's worn pin stacks or a bent key. Get it checked before it strands you.
3. Visible corrosion or rust
Once oxidation is inside the cylinder, the lock will fail without warning. Replace.
4. After any attempted break-in
Even if the lock 'still works', internal parts may be compromised. Always replace after forced-entry attempts.
5. You've lost track of who has a key
Not a mechanical issue, but a security one. Change the cylinder.
Start by proving it is the lock at all
Before anything else, do two free tests, because between them they explain a large share of the calls we go out on. The first is to try whichever key in the house gets used least — the spare in the drawer, the one on the visitor's ring, the original from the estate agent. If that key turns cleanly when the everyday one does not, the mechanism is healthy and it is the key that has worn out. Blades tire, and a duplicate cut from a duplicate drifts far enough from the original profile that it stops presenting the shape the lock is waiting for. We have written about doing it yourself or calling somebody at greater length elsewhere on the site.
The second test is to work the mechanism with the door standing open. Turn the key, throw the bolt, release it, several times. If it operates smoothly in mid-air and only misbehaves when the door is closed, the lock is not the problem either — the door and the frame have moved relative to each other, and the bolt is catching on the edge of the keeper rather than dropping into it. That is an alignment job, not a replacement.
Only when a lock fails both of those tests is it genuinely a candidate for replacement. It is worth being pedantic about this, because a replacement fitted to cure an alignment problem behaves exactly the same way within a fortnight, and the household concludes that locks are unreliable when in fact the diagnosis was wrong. Ask anybody quoting for a new lock which of those two tests they ran.
The four failures that genuinely mean replace
The first is play in the cylinder. If the key can be wiggled several degrees side to side once it is inserted, the internal components have worn past their tolerances. A rebuild is theoretically possible and almost never worth it on a domestic lock, because the labour costs more than the part. This is the classic end-of-life symptom and it develops slowly enough that households genuinely do not notice it happening.
The second is corrosion, and on outdoor fittings in Randburg it is more common than people expect. Once oxidation has established itself inside a mechanism, the failure mode is sudden rather than gradual — a lock that worked yesterday will not turn at all this morning, usually after a cold night. Exposed gate and outbuilding fittings on high ground get this first, which is why the ridge suburbs see it more than the sheltered ones. The difference between a lock that is dying and a door that has moved is the sort of thing a locksmith in Randburg is expected to get right without being asked twice.
The third is anything that has been forced. A lock that survived an attempt and still turns has still had its internal parts loaded far beyond what they were built for, and it will fail at some point of its own choosing afterwards. The fourth is not mechanical at all: you no longer know how many keys exist. The lock may be perfect and still be the wrong lock, and that is a lock change rather than a repair.
What a repair actually fixes
Alignment is the commonest repair and the one that surprises people most, because nothing about the lock is wrong. Buildings settle, doors drop on their hinges, timber swells through a wet season and shrinks through a dry one. The bolt that used to drop cleanly into its keeper starts catching, and the household compensates with a lift or a pull without ever discussing it. Correcting the hang or moving a strike plate a few millimetres cures it properly.
Servicing is the second, and it matters most on anything outdoors. Mechanisms that have collected dust, grit and moisture over years stiffen gradually, and the point at which they stop entirely is not predictable. A gate mechanism that has been getting harder to turn for two seasons is on exactly the same path as a front door that has started needing a knack, and it is worth attending to for the same reason.
The third is the door furniture rather than the lock: a handle that has worked loose, a spindle that has worn, a lever that no longer lifts the mechanism fully. Those present exactly like a failing lock from the user's side and cost a fraction of one to put right. Any of them falls under ordinary lock repair, and on a fair share of the calls we attend, that is the whole job.
Why leaving it is the expensive option
A lock that has started asking for help does not get better and it does not fail at a convenient moment. In our experience the actual failure lands disproportionately on evenings, weekends and the morning somebody is leaving for a trip with luggage already in the car. That is not superstition — it is simply that those are the moments a mechanism gets used under pressure, in the cold, by somebody in a hurry.
The arithmetic is straightforward. Attended to as a booked visit in daylight, it is a small job with the door standing open and time to look at the frame properly. Attended to as a failure at eleven at night, it is the same work as an emergency locksmith call-out, on a door that now has to be opened before it can be fixed. Nothing about the mechanism changed between those two visits except the hour.
So the single habit worth adopting is not ignoring a door that has begun needing a knack. Households absorb that adjustment so completely that within a few weeks nobody remembers the door ever behaving differently — which is exactly why it goes unmentioned for a year and then becomes an emergency. It is the cheapest piece of advice on this site and it is the one most often disregarded.
What to expect a proper assessment to include
A useful assessment starts with the door open and the mechanism worked by hand, because that separates the lock from everything around it in about thirty seconds. After that it should take in the hinges, the frame, the strike plate and the keeper, because those are where the majority of so-called lock faults actually live. Anybody who quotes for a replacement without having opened the door and worked the mechanism has diagnosed nothing and is selling you a part. The same vehicles cover locksmith work in Randburg CBD on this round, and that suburb has a page of its own.
It should also take in the keys, all of them, not just the one you handed over. Where one key operates cleanly and another does not, the answer is already known and it does not involve buying anything. Where every key behaves identically badly, the mechanism is genuinely the suspect. That is a two-minute test and it is the difference between an honest quote and a guess dressed up as one.
Finally it should say plainly which of the three outcomes you are looking at: nothing needs doing, a repair will settle it, or the mechanism is at the end of its life. All three are legitimate answers and the first is more common than most households expect. If the only outcome ever offered is a replacement, that is worth noticing — our guide to choosing a locksmith covers the other warning signs.
What to ask whoever quotes you
Ask what they actually found rather than what they propose. A useful assessment names the state of the frame, the hinges, the keeper and how far the cylinder protrudes, because those are where most so-called lock faults genuinely live. A quote that arrives with none of those observations in it is a price for a part rather than a diagnosis of your door.
Ask whether the two free tests were run. Did they try a different key, and did they work the mechanism with the door standing open? Between them those separate the lock from the door and from the key in under a minute, and skipping them is how a household ends up with a new cylinder behaving exactly like the old one.
And ask what happens if the answer is nothing. On plenty of doors the honest outcome is a clean, an adjustment or a fresh key cut to the right profile, and none of those involves buying a mechanism. If the only outcome ever offered is replacement, that is worth noticing — our guide to how to choose a locksmith covers the other warning signs.