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Design a locker system like Amazon Locker where delivery drivers can deposit packages and customers can pick them up using a code.

Clarifying Questions

• Establish scope: Are we modeling just the piece from when the driver arrives at the locker until the customer? How does the customer get the code?
• Questions on core flows: Are there different sized compartments? Can a small package go into a large compartment if the small ones are full? Are access tokens unique per package?
• Edge cases: What if someone enters the wrong code multiple times? What happens to a package if it’s never picked up? What if all compartments of a given size are full when a driver tries to deposit?