Sagging hinges and worn out mechanisms are possibly to blame. Adjustment of the door also. If you lift the door and it moves up and works better then the hinges are worn. If all that is good then start searching for a new latch mechanism. They are out there. I bought a new one off eBay for like $125 about a Year ago for the 66’.
Thank you for your helpful response. I have another latch mechanism. I don't want to replace the mechanism until I know more. I have learned to move cautiously so that I don't cause unnecessary problems.