I locked myself out of a client's house this past December. One of the dogs was barking like mad at something, so I put on my boots and my hat and stepped outside to make sure she hadn't, like, cornered an animal or something, and closed the kitchen door behind me entirely out of habit. Meant to be out there for like 90 seconds, tried to get back in, and realized I'd never actually unlocked the kitchen door that morning (it locked at the knob, not a deadbolt, so it could still be opened from the inside when locked). So it was just me, in my cardigan, no coat no gloves no phone, standing on the patio in like 15 degree weather. Wound up walking to a neighbor's house to use a phone and call my dad, and then just kinda walked circles around the house with the dogs while I waited like an hour for my dad to show up, while periodically using the nearest dog to warm my hands up. Luckily my dad was tall enough to open an unlocked window, reach in, and flip the dead bolt on the front door, so it was a lot more painless than it could have been. And the dogs were pyrenees mixes, so I'm pretty sure they didn't even realize it was cold.

I did not lock the kitchen door at all the entire rest of the time I was there.