My 1978 Rockwood has a Decker 1042 lockset on the door. However, I do not have any keys for it. The lock cylinder says "A111" on the front. One of the keys for my Kennedy toolbox kinda-sorta works, but it can be tricky - it isn't a simple stick-it-in-and-turn-it thing, you have to jiggle it around a bit. I know popups are easy to break into, but locks keep the honest folks honest (and helps keep at least some of the dishonest ones out when the camper is in its collapsed/folded position). Is this a hard lock or an expensive one to find keys for? Or is there a modern-made lock that could be installed with a minimum of fuss? Not trying for vintage restoration, just function on this camper.