What do I do if I lock my only set of car keys inside my car?

There are a number of locksmithing outfits that can open a car door. Generally, it's easier not to pick the lock.

If you can easily prove ownership of the vehicle to a dealer, they can sometimes cut a key from the VIN code.

A low-tech approach is to break a side window. One that's easy to replace.

Yep, about 85 bucks here they come out and open the door.

If you have a road service supplier like AAA, they often include a locked out service.

The big question is WHY would you only have one set of keys?