I have this simple door I want to share.
It is also a sort of prank to any visitor i might have.
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The fence prevents you from walking trough the gap because its 1.5 blocks high.
Power it with a simple redstone signal and it opens so you can walk trough.
The wool carpet prevents you from falling in the hole and disguises the door.
I use this in combination with my grief revert so that no outsider can open it.