That's precisely why I don't lubricate them at all. If they get "sticky", I just blow them out with a can o' air. You see little brass particles fly out for a sec, then it works
fine again after a few jiggles o' the key. I've also spit on a key and stuck it in a sticky lock and jabbed the key in and out a few times while jiggling it to free it up. Worked great until I could get another lock ...