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Barricade SWEP

Located in "Other" weapon tab.

Board up your windows/doorways with wooden planks, or simply repair and break things.
Hold M2 to switch placement mode and plank size.
Dustruct mode breaks any breakable thing in one hit, players and npcs not included.
Repair mode heals non-creature things, up to 10 times of their max health.
Hold E and press M1/M2 to rotate placement angle.
You can break your placed planks easily with destruct mode or simply pressing Z to undo them.

It's not easy to make, but that's it.