well.....on my games i usually need a lever to use them. Of course it's likely just me and you can just use it like a real door
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Place wooden planks in all of the boxes in a crafting table apart from the top three.
As a trap card, you cannot activate it on the turn you Set it. However you can activate it in any turn after that, including your own, if you wish.
To open or close a iron door you need a redstone signal to activate it. Some different blocks you can use to produse a redstone signal is a button (wooden or stone) pressure plates, light sensor, or lever.
At a Crafting Table, place Wooden Planks in the following configuration, where W are Wooden Planks and E is an empty space. EEE WWW WWW
As a trap card, you cannot activate it on the turn you Set it. However you can activate it in any turn after that, including your own, if you wish.