First check out the buttons in the door jambs. The switch is behind a little rubber boot (well, it is on my 4-door)... Maybe the switch is just loose in it's mounting or something simple like that.

Then you just gotta loosen all the bolts for the door hinges & adjust the position of the door. Then loosen the latch & striker & adjust them. But it's easy to muck it all up & then your door looks like it's not lined up right.