In life there are different situations, such as the following:
left the keys in the ignition or the seat, out of the car,
the door slammed shut, and alarm - op, and lock the door.
You're lucky if the hand was the second set of keys.
But, unfortunately, this is a rare case.
"What should I do in this situation?" - You ask.
Some call relatives and wait until they bring up a second set of keys,
others cause a special service for opening car.
But there is a third option: to break the glass.
In continuation you will find instructions on how to correctly you must break the glass,
to inflict minimal damage to your car.