The Door is Sticking
Doors are great. Not just because we need them to section off parts of the house or keep bugs and weather outside, but because they are simple mechanism that do a good job. However, as temperatures change and the soil shifts a house, doors can become stuck or crooked.
Loose Screws in the Hinge
Do you have to pull hard to open a door and push even harder to close it? The first spots to inspect are the hinges. Make sure each screw is tight and snug. If you try to tighten a screw and it keeps spinning, the wood hole is probably stripped. Use a longer screw to dig into more material. Hopefully this will solve the problem and the door will operate normally.