What you need to do is remove the door panels, ***** etc. Your car sounds like it has not been worked on in a few years ( interior of door cleaned) It would be a good time to clean you door latches of 40 year old dirt and grease, reline you door channels, etc.
Get a service manual for your year car, it will show you how to remove all the parts. Take a lot of pictures as you go, before you take apart.
You need weatherstrip adhesive remover, sold at Napa or online vendors, black weatherstrip adhesive. Lots of posts on how to do it.
You doors and windows will be like new if you take your time. before you remove the weatherstripping, take interior of door apart , glass out etc. Weatherstrip last. Call for help when you are ready to do it.
But you will be amazed at the dirt in your lock and latch mechs. Soak and clean and they will work like new.