Got any pics? Gen.1 doors are NOTORIOUS for sagging - the metal of the door at the hinge, is WAAAYYY too weak - it's a common occurence, and the sag WOULD prevent your door from latching properly if it was bad enough.
I'm having the shop that's doing my re-gear, also
fix my driver's side door sage. A nice stip of 4" wide, & about 18" long 1/8" steel plate, welded to the door, with the hinge bolted through it, should firm it up considerably!