The call we get most from this area starts the same way: the door won't budge, or it opens a foot and stops, or it slams down the last two feet instead of settling. All three usually trace back to a spring that's lost tension gradually rather than snapped clean, which is common on hardware original to a house built in the mid-1970s.
A door that reverses right after the floor, or won't close all the way and backs itself up, is more often the opener's safety sensors than the spring - dirty lenses, a knocked-loose bracket, or a sensor that's aged out. We ask which symptom you've got before we guess at parts, because a spring problem and a sensor problem look similar from the driveway but need completely different fixes.
A grinding or popping noise on the way up, without the door stopping, is usually a roller or a section of bent track - annoying, not urgent, but worth booking before it turns into the door jumping the rail entirely.