A garage door doesn't have to be hooked into an automatic door opener to suffer issues. There are damages that can affect manually operating doors and prevent them from working properly.
1. Track Problems
The most common type of problem is likely with the track. Tracks can become dirty and warped over time. Cleaning them out so that no cobwebs, leaves, or other debris prevents door operation can help. More severe issues may require that the track is re-aligned or that bent and damaged sections are replaced.