Warbler said:
Dear Warbler,
Whenever you stop somewhere get out of your car, before you lock and shut the doors, MAKE SURE YOU HAVE YOUR KEYS AND THAT THEY ARE NOT STILL INSIDE THE CAR!!!!
Sincerely,
Warbler
My mom used to do this all the time when I was a kid, and we would have to wait wherever we were until my dad got off of work and could come and unlocked the car. It's the reasons I was given a copy of the car keys to keep in my pocket at a young age.