Beware cheap combo locks
I've encountered several of those mechanical number pad with round knob or handles to open the door. Unfortunately a number of these accept the combination in any order, so a quick polish of the keypad and a bit of patience will reveal which have finger prints on them and the code.
My wife's old school had one and I suggested she tried this out as there had been a recent debate as to what the code was and a colleague had been adamant my wife had the code wrong.
One quick demo later was enough to get all of the combos replaced.
Biting the hand that feeds IT
