Door hard to swing

Hi, I just got my '86 sovereign 26' back from the shop for an electrical problem, and when I opened my door it was tough to swing and made a horrible squeal. Upon further inspection, the door jamb is not straight, the crack is wider on the bottom of the latch jamb than on the top. How did it get so catty wompus so quickly and how do I fix it??



Thanks for the help!!!