The Way Everything Works on Instagram: "Picking a lock with a piece of paper is based on how simple pin-tumbler locks are designed internally. Inside the lock, small spring-loaded pins sit in two parts: the pin stack and the plug. When the correct key is inserted, it lifts each pin to the exact height where the gap between them lines up with the plug, allowing it to turn. A thin piece of paper or similar flexible material doesn’t “unlock” the door by force—it’s used to apply light tension while