Go down to the local 7-11 and tell the grots that are always hanging around outside that you'll give them 50 baht to solve the problem. They'll do it within 5 minutes with no damage to the door, handle, lock, or frame. Make sure you hide all your valuables before you let them in the house.
This approach also works when you can't find your car keys and/or your car will not start.
bobforest