rear drivers side door wont open when u unlock it, to open it u have to pull the door pin rite up and pull door handle at same time to open.

when i unlock the car the door pin dosn't come rite up only half way up plus when u pull it up its very stiff and only moves a tiny bit but its just enough to open door.

any ideas plus how do i remove the rear door cover to get to problem.
many thx.