Garage door openers, manual release mechanisms...
My one has the pull chord inside the garage which disconnects the door from the motor driven thread enabling you to push the door open. If your garage door has one of those locking handles which rotates moving bars out to lock into the frame..... Maybe you could disconnect the bars and the connect the chord to the mechanism that turns. When locked from outside it does nothing. When unlocked from outside and turned it pulls the chord and disconnects the door for you.
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