Most Murphy garages were built around 2005, which means you're almost certainly looking at a steel sectional door, two-car width, hung on standard galvanized track with roller brackets bolted to a plate - not the older wood-panel doors on stamped hardware you'd find in a neighborhood built in the 1970s. That construction era matters here because builder-grade track from that period uses lighter gauge steel than what goes into custom or replacement installs today, and the roller brackets are often held with fewer fasteners than a heavier door really wants.
When a door of this size and weight comes off track in a Murphy garage, it's usually one of two things: a bent track section from the door being forced past an obstruction, or a broken roller bracket that let one side of the door drop while the other stayed up. Either way, the door binds sideways in the opening instead of running straight up and down. You'll see daylight gaps between the door and the frame, or hear a grinding scrape instead of a smooth roll.
We don't guess at this over the phone. A door that's off track needs eyes on the actual bend, bracket, or roller before anyone says what it'll take to put it right.