Why do rear doors become stuck on a 2009 ford ranger extended cab?

Why do rear doors become stuck on a 2009 ford ranger extended cab?

Added (1). The rear doors on my 2009 Ford Ranger, with extended cab with jump seats keep getting stuck so they won't open. The dealer fixed them twice but they gradually become harder and harder to open until they won't open at all?

Take it to a body shop for a opinion on why its happening

Hinges maybe out alllignment or it needs lubricant on catches. The vehicle chasis is distorted so the doors are now an integral part of the cars superstructure.