What am I riddle..... Star if you like?!

Question: I turn around once.
What is out will not get in.
I turn around again.
What is in will not get out.
What am I?

Answers: I turn around once.
What is out will not get in.
I turn around again.
What is in will not get out.
What am I?

Its a key

Hard riddle well done

a door

Stoned

a door

a lock

a key/ lock

a key

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What am I riddle..... *Star if you like*?!