A key has snapped in a commercial lock

Stop using the lock. The most common way a recoverable extraction turns into a cylinder replacement is somebody trying the other half of the key, or a spare, and pushing the fragment further in.

If a stub is clearly protruding, fine-nosed pliers pulled straight out along the line of the keyway sometimes take it. Pull, do not twist, and stop if it does not move. If nothing is protruding, leave it alone.

What makes it worse

• Superglue on a matchstick. It bonds the fragment to the pins and to the plug, and what was an extraction becomes a replacement.
• Pushing anything into the keyway. Paperclips, screwdrivers and blade fragments all drive the piece deeper past the point where an extractor can reach it.
• Lubricating spray. Oil-based sprays attract dust and gum the mechanism, and they rarely help. If a lock genuinely needs lubrication it needs a dry graphite or PTFE product, and it needs it as a repair rather than a rescue.
• Trying the spare. The spare meets the fragment and pushes it home.

Why it broke

Keys almost never break because the key was weak. They break because they are being forced, and the force is coming from somewhere.

A cylinder that is binding takes more turning effort every month until something gives. A door that has dropped or is under building pressure loads the bolt, so the key is fighting the weight of the door as well as the lock. And a worn key in a worn lock reaches a point where the cuts no longer lift the pins cleanly and the natural response is to push harder.

That matters because extracting the fragment fixes the symptom. If the cylinder was seizing or the door was loading the bolt, the next key will break too.

What happens on the visit

The fragment is extracted with a proper extractor, which reaches past the pins and draws the piece out along the keyway without driving it deeper. Most cylinders survive this without damage.

Then the cause gets checked, because that is the part that stops it recurring: whether the plug turns freely once cleared, whether the door is hanging correctly, whether the bolt is under load from a dropped door, and whether the remaining keys are worn enough to be worth recutting from the original code rather than copied from a copy.

Where the cylinder has been damaged, either by the break or by an earlier rescue attempt, it is replaced. If the property is on a master key system, the replacement is pinned back into that system rather than left as a one-off, which is a detail that gets missed and quietly puts a door outside the hierarchy.

Whether to rekey

If both halves of the key are on site and accounted for, this is a maintenance event and nothing more. If part of it left the property, or the key was one nobody can account for, that is a different question and rekeying is the only way to close it.

Whether it can wait

If the door still locks and unlocks on another key or from the inside, this is a scheduled job. If the fragment has left the door unlocked, or locked with nobody able to open it, it is not.

The case worth acting on quickly even when nothing is stuck: a key that broke because the cylinder was seizing. That lock is failing and the break was the warning. Leaving it means the next key breaks too, probably at a worse moment, and the second extraction is more likely to damage the cylinder than the first.

Tell us on the call whether the door is currently secure, whether a spare exists, and whether the lock had been getting stiff. That last one changes the visit from an extraction to an extraction and a replacement, and it is better known before the van arrives than after.

Keep the broken half of the key. It shows how the cylinder was cut and it makes originating a replacement straightforward, which matters most on a master keyed system where the new cut has to sit correctly in the rest of the suite. Without it, the replacement has to be worked back from the lock itself.

Who carries this out

Key extraction, cylinder repair and replacement, rekeying and master key work require no Florida contractor license. TrionX performs all of it with its own employees, and any lock replaced on a master system is repinned into that system with the register updated when the work is done.