Videos at YouTube show how it is done.
- Straighten a coat hanger, but leave a curved hook on one end.
- Push the hooked end of the wire through the weather seal between the frame of the house and the top of the garage door in the area shown by the red arrow. (It is possible to push some garage doors inward at the top to create a gap large enough to insert one's own hand into the garage.)
- Catch the emergency release lever (yellow arrow) and gently pull until the lever releases.
- If necessary, hook the red cord and pull it to release it or pull it toward the door where it can be grasped by the hand and pulled.