The door sticks on my microwave oven

Usually this is due to loosened mounts inside the oven. The mounts hold the door switches and grab the door hooks when it the door is closed. The solution is to realign and tighten the mount screws inside. It's less liekly, but it could be a weak or worn door open lever inside. I only advise people to work on a microwave if they're fully informed and aware of the deadly hazards and necessary precautions.

DON'T remove the cover yourself unless you fully undertand the SAFETY issues involved in working inside a microwave oven. A microwave oven is possibly THE MOST DANGEROUS common consumer product to service. Usually with these doors, the latching parts tend to loosen up at times, thus requiring some re-adjustment and tightening. Sometimes they get a bit warn and require to be replaced. A good cleaning might also do it. A note to be on the safe side: don't spray any wd-40 into it, it can cause more problems and isn't likely to solve anything. Good luck

I FIXED MINE AND IT WORKS LIKE NEW AGAIN. JUST GET A FINE GRAINED SANDPAPER AND LIGHTLY SAND BOTH THE DOOR AND OVEN WHERE THEY MEET, AND LIKE MAGIC IT'S BEEN WORKING JUST FINE. NO MORE FRUSTRATIONS!!!!!!!!!!