There are several ways to fix this:
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Change difficulty to peaceful.
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Destroy,block-up, or take down the door.
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Dig a 15x15x25+ hole in front of the door.
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Make a trap in front of the door.
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Mods(turret, bodyguards, pet sharks,warriors, something).
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Start a new world.
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Stop playing Minecraft (even though it's FREAKIN AWESOME).
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Run, dig, or tower yourself 16+ blocks away.
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Suicide?(In Game)