My passenger door handle seems to have jammed up. It started out just getting a little harder to pull up and open. Then it stopped working from outside. The only way to open it is from inside but is still difficult to the extent of fear of breaking the damn handle. I have also had to lock and then unlock and then lock again with a key just to get the doors to lock. Any ideas on what it is and how to fix it. I can't stand tinkering with doors.