Schlage Lock question
She had a move out of an apartment and the tenant key and the master key worked fine when she went in to look around, now today she says that the tenant key and the master key won't open the lock and the door is locked and wants me to get it open, first thing I am thinking is that a master wafer has become stuck in the keyway, other than that what the heck do you guys think I am going to find? I can't pick the lock to get in if the key don't work, I may be able to use my lever opening tool if I can get it in the door, but what else should I do other than drilling the lock? It may be an easy fix but I haven't looked yet, only thing that worries me is that I hate to mess with master key systems, I don't want to mess up some guys system. What do ya think?