system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do locks have unique keys even though they are produced in huge numbers?

Edit: thanks for the answers!
gpt
For common house locks, they don't have to be unique.   There just have to be enough combinations that the chances of a random key combination working on a random door are low enough where it's not an unacceptable risk.