[Tx Firefighter]

Exactly, Blue Beard is right. The key is softer than the lock tumblers for a reason. The key is meant to wear so the lock won't.

If someone had new keys cut and they still come out like the old key did, it's because the new key is an exact copy of the old worn out one..

A new, proper, key should make it like new again, and stop some of the frantic searching around in the dark floorboard area for keys that fell out.