Treat the door as dead weight until the spring is replaced. Without the spring, a double door can weigh 300 pounds or more, and the opener is not built to lift it: running the opener strains the motor and commonly strips its gear, adding a second repair. If a car is trapped and you must move the door before help arrives, that is a two strong adults, extreme care decision, and never with anyone standing under the raised door. The standard advice is simpler: call, and let the spring go on first.
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