Being locked out of your house or your car is definitely a big inconvenience. The most obvious solution would be to call other people you are living with for help. You sure ask them where are they and what time would they arrive. If no one answers, you’ll kick the door out of frustation and hurt yourself in the process. Instead of going through a lot of hassle, call your locksmith right away.
Better yet, before the situation calls for it, you should have the contact information of your trusted local locksmith.