system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are car keys usually two-sided, whereas house keys are usually one-sided?
gpt
Car locks become harder to pick as they have pins on both sides of the tumbler. More specifically, it's pretty much impossible to single-pin pick a car lock. Since it turns out that more people look to break into a car than break into a house, it's worth it for that little extra security.