This question recently went viral online due to a YouTube video that said it is possible to unlock your car doors with just a tennis ball. The video showed a girl burning a tennis ball with a small hole in it, she placed it over the automatic door lock, squeezed it hard and claiming that the air pressure from the ball would automatically unlock the door.
The story gained so much traffic that Discovery Channel’s Mythbusters did a whole episode on this to prove whether or not it was possible. After few tests, they found that the technique is not working – myth busted.
They used 100psi of air pressure but still couldn’t get the door open.