Your question is Locker Delivery and OTP System. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design locker service where delivery guy can put parcel in locker and OTP and locker details will be sent out to customer. Customer can go to nearest locker and can receive parcel by validating OTP as password.
Asked in the Round 2 LLD stage. Discuss the deterministic locker workflow first, then identify where ML can improve locker selection or detect suspicious access without weakening OTP security.