How to build a 2x2 piston door in Minecraft
Put a Stone Pressure Plate on each of the 2 floor blocks in front of the doorway and the 2 behind it.

The Stone Pressure Plate is two stone side by side, the classic trigger for doors that only people and mobs should open. A pressure plate sends a redstone signal while something stands on it.
It is made with the Crafting Table from 2 × Stone. It is mined with a pickaxe.
Stone and polished blackstone plates react only to players and mobs, so dropped items never trigger them: the safe choice for automatic doors. Wooden plates, by contrast, react to anything, items and arrows included.
Weighted plates count what stands on them and give a signal that grows with the number of entities, items included. The light one, made of gold, reaches full strength with 15 entities; the heavy one, made of iron, needs 150, which makes it a measuring tool for item and mob farms.
2 × Stone → Stone Pressure Plate
// Slots with several items cycle through every accepted option.
Put a Stone Pressure Plate on each of the 2 floor blocks in front of the doorway and the 2 behind it.
6 Iron Ingots, 1 Stone Pressure Plate, 1 Redstone Dust
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At the Crafting Table: 2 × Stone give 1 × Stone Pressure Plate. Mining the block drops it.
It sends a redstone signal while a player, mob or item stands on it. It is an ingredient in one recipe: Detector Rail.
The fastest tool is the pickaxe.
Placed under a Note Block, Stone Pressure Plate gives the Bass drum sound.
No: when a piston pushes it, it breaks and drops as an item.