Just below the lock (on the door) and the lock keeper (on the door opening), you may find a curious pair of metal wedge brackets, which is designed to take the weight of the wheel off the lock. Frequently missing.
If you pull the door from the inside and there is significant movement, it may be possible to move the keeper in slightly to eliminate some movement. Move it too much, and the door won't close/lock , so go in small steps.