I have a 2000 Winnebago RV Class A. I have been having problems with the lock on the outside door. Put the key in, turn, wont move. I can use the turn knobs on the inside of the door and they turn just fine. Finally got them to turn once and cant do it again. Now I'm locked out. Anyone know any tricks to get this open? I dont want to break the key off trying. Thanks for your help.