Design a good application. For "Dracula," for example, you may want to open and close a door without apparent human interaction.
Acquire two upright bicycle air pumps.
Empty two tall spray cans that have nozzles with permanent "straws" attached. Discharge all the product in the cans.
Attach the bicycle pump hoses to the two spray can straws. Pump air into the cans slowly. Two compressions will recharge most cans. Detach the hoses.
Mount the pumps horizontally to a board, with strap hangers, so the pump handles can extend and retract without touching the floor. Lay the pumps down on the floor on the upstage side of the door. One pump handle should face the door. The other pump handle should face away from the door.
Extend the pump handle on the unit facing the door. Use a long metal rod that is equal in length to the width of the door to create this extension. Add a small "pusher pad" to the end of this rod and attach it to the door with wood screws. The face of this pusher pad should be directly beneath the door handle at the floor level.
Open the door. With the pump handle fully retracted, adjust the position of the pump. When you extend the pump handle, the long rod should push the door closed. Experiment until you find the correct location of the unit that achieves this result. Tack down the unit.
Sink an eye screw into the door. This eye screw should be in the same vicinity on the door as the pusher pad. Run a wire back to the pump that is facing away from the door and connect it to the pump handle.
Close the door. Fully retract the pump handle. Adjust the location of this pump so that when you pull the pump handle out of the wire, it pulls the door open. Tack down this unit.
Remove the air hoses from the pumps. Connect the air can straws to the pumps. Use extender tubing if desired.
Open the door. Force air into the first pump by pressing the spray can nozzle. The pump handle will extend and push the door closed.
Close the door. Press on the air can nozzle on the second pump. The pump handle will extend and pull the door open.
Make adjustments as needed. If necessary, loosen the door hinges so they have a lot of "play." Use a lightweight door.