the drivers door is hard to shut and the locking system is messed up

There is possibly a sensor switch in the door post that activates when the door is open or closed and it may be coming lose and causing the door not to freely close. Have someone check for that. It should be a push type button about 1/8 inch in diameter held by a small nut. That may be causing the problem or the door is out of adjustment. Not a strong possibility but if the car has been damaged and the door was not set properly or tightened correctly is may be lose and out of adjustment. Go to a body repair shop if you want and ask them to check the door closing and opening tolerances.