Arcadia's housing mostly went up around 1965, later than a lot of the neighborhoods closer to central Pasadena, and that shows in the garages. These are wider, two-car openings built for a family with two cars in the driveway, not the narrow single-bay stalls you find on 1940s lots. The doors on them are heavier steel sectional units riding horizontal track along the ceiling, hung on extension or early torsion hardware depending on when the house was last updated.
When a door goes off-track here, it's usually one side that's jumped the horizontal rail while the other side is still riding it, which is why the door binds, tilts, or won't budge past a few inches. We start by killing power to the opener so nothing tries to force the door further, then we check whether the track itself bent, a roller sheared, or a cable slipped off its drum. On a door this size and weight, we don't try to wrestle it back into the track with the springs still loaded - that's how a hand gets caught. We relieve tension first, reset the panel into the rail, then check the whole run of track for the spot that let it happen in the first place.