Do you know what is the air wedge? If you are still confusion, now after seeing this, you will know it clearly.
What is air wedge?
An air wedge is a pump connected to a high-tension bag. This is a more brute force approach to opening a locked door, but it is effective. To use, you pry open the top of the car door with your hands, slip the air wedge inside and use the pump to hold the door open whilst you manipulate the locking mechanism inside the car using a coat hanger or a slim jim.