on a A320 as there is a flap you have to push in to get hold of the handle. to open the door you first have to pull the handle then twist or on newer A320 pull the handle towards you which opens the door a few inches. there is a switch under the belly behind a door that you then have to press to open the door fully.
Quite obviously, the aircraft would still need to be on the ground for the bird to accomplish all of that.