Auto door realingment specialists in s.east wisconsin,are there any???
The striker may need adjusting or just some lube. But it really sounds like the hinges are shot. Open the door and grab the lower corner furthest from the hinge and lift. If it moves up and down, the pins and bushings are worn. A repair kit(if available) or new hinges are required to properly repair.
You can go to a Ford dealer or any reputable shop for this.