There aren't many feelings more frustrating than the moment you realize you locked your keys inside the car. However, if this happens to you, there may be a surprising way to take care of the problem (video below).
If you get locked out of your car and don't have a spare key on hand, there may be something you can do to get into your car. All you need is a tennis ball, according to NX2.
To unlock your car with a tennis ball, you simply have to make a small hole in the ball, using a heated key or screwdriver.
Once you have punctured the ball, place the opening of the ball directly over the keyhole and press down. The pressure from pressing on the door can increase air pressure in the lock and should force the locking mechanism to open and unlock your door.
See the video below for an example of how to use this method.