Something else is going on. a garage door is heavy, but two people should be able to lift it up for sure. Are the cables attached? did you check to make sure the cables didn't come off the pulley and get wedged inbetween the pulley and bracket? this might cause the door to lock up or cock it enough to jamb it up.
this is starting to bug me, i can't imagine how you feel!
Those who can, do...
Those who can't criticize on the internet