Back to School Riddles

I have a door but I'm not a classroom. I keep your backpack safe inside me. You need a key to open me. What am I?

I have a big wood floor. You visit me for games and exercise. I have basketball hoops and bleachers. What am I?

I am a quiet place. I keep books and computers. You borrow from me but must bring things back. What am I?

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