Riddle #22: Can’t Open Any Door

I’m full of keys, but I can’t open any door. What am I?

Check the answer below:

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Answer: Piano.

MORE:

Riddle #15: What Is It?

Riddle #16: What Walks?

Riddle #17: What Is It?

Riddle #18: How Many Were There Going To St. Ives?

Riddle #19: Who Am I?

Riddle #20: When You’re Done With Me

Riddle #21: What Rock Group?