Don't lock the what...?

Troy was working at the house when I left work last night. I stopped by his place to pick up Dozer and started his old truck to take to the new house. I let the truck run for a bit, grabbed the dog and locked the door behind me. I put Dozer in the truck, along with the keys and my wallet and shut the door. After scraping the snow off, I tried to get back in... and I was LOCKED out! I'm not sure if Dozer hit the lock or if I accidentally did when I tossed everything in the truck, but either way I was LOCKED out of the truck and she was LOCKED inside. :) I called Troy to save the day and he arrived a good 20 - 25 minutes later. I was freezing (luckily I dressed warm!) and wet. We got the spare key and unlocked the truck, grabbed the dog and were off to the new house.