With many keys but cannot open a single lock

Common Wrong Answers
“A piano”
While a piano has many keys, it is designed to produce music rather than to serve any function related to opening locks.
“A map”
A map contains symbols and legends that guide navigation but does not have 'keys' in the sense of physical keys meant to unlock anything.
“A treasure chest”
A treasure chest is specifically designed to be locked and unlocked, contradicting the riddle's premise of having keys without being able to open locks.
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