1965 Dodge Dart Door Locks...

I've been dealing with the door locks myself for the last few days.
On the driver's side, it has always been fidgety - have to wiggle the key to get it to turn.
A few days ago, the key wouldn't go in at all. Took it to a locksmith, and they replaced the little pins with slightly larger ones. They had worn the slots over the years and were sliding crooked. Works better now, but I still have to jiggle it a little to get the key to turn to the right.
Went to the junkyard and got new locks off an old truck. They looked almost the same, but didn't fit. I'd have to cut the hole in the door and I'm not going to do that!

If you're only having problems with the driver's side lock, you can swap it out with the passenger side - that's what I'm going to do.

What kind of problem are you having?