I have never had a problem with mine. Just bend a lift with your knees with the door pretty far open. I know it matters how I lift if I'm flat ground or not as well so take that into account
When my daughter was born, I went 2 years without pulling the doors. It took lots of WD-40 and jacking at the bottom while wiggling the door to get them out.
Now I make it a point to apply anti-seize at the end of doorless season. It really helps.