Yes, you can still open the door manually with a broken spring in an emergency to get your car out, but it will be extremely heavy and dangerous, and you should not use the automatic opener to do it. When a torsion or extension spring breaks, it no longer counterbalances the door's weight, so the full weight of the door, which is typically 150 to 300 pounds depending on size and material like wood or insulated steel, rests on you. To open it, you must first disconnect the opener by pulling the red emergency release cord hanging from the trolley so the door can move independently. You will need at least two strong people lifting evenly from the bottom, using your legs not your back, and keeping the door level to prevent it from binding in the tracks. Once open, you must securely prop it open with locking pliers or clamps on the tracks or a ladder underneath, because without spring tension the door will not stay open and will slam down violently, which can cause serious injury or damage. You should never leave it propped open unattended. The opener should not be used to lift a door with a broken spring because it will strain the motor and strip gears. This manual opening should be temporary until a professional replaces the spring for 200 to 600 dollars.
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