Sci-Fi Door (Tutorial Included!)

Hey guys,

I've made a tutorial on how to build my favourite door in Minecraft.
If you close it once you are inside, it stays locked, so it's a great way to protect your home :)

I'll also be building a version that has a nice trap in it ^^

Total dimensions: 17 x 5 x 7

Total Crafting ingredients:
Redstone Dust: 103 (18 - 26 blocks)
Stone: 39
Cobblestone: 24
Wooden Blocks: 9

These will be used by using / crafting:
Redstone dust: 50
Repeaters: 13
Sticky Pistons: 6
Redstone Torches: 4