The Laser door can be operated with a lever. Pull the lever up to lock the door and nobody will be able to pass through.
In this guide, you will learn the method to make a Laser Door in the Minecraft game.
In order to make a Laser Door, you have to dig the ground up to 5*3 blocks. Dig this ground to 3 blocks deep.
After this, you have to place iron blocks in the dug ground and then 3 beacons in the middle.
Cover the iron blocks on the sides by placing glass blocks on them and add three redstone repeaters in front of the beacons. Dig the ground and use redstone in it as shown in the image below.
The next thing you need to do is to add oak fence gates at the top of the beacons. Place a lever on the ground and pull it down to activate the Laser Door.
Now you have to cover the middle part with white carpet and fill the gaps on the sides by placing grass blocks.
Then add three iron blocks on the laser and red stained glass blocks on the laser beams. Add white carpet at the top of glass blocks as shown in the following image.
You have successfully made a Laser down. Pull the lever down to unlock and pull it back to lock the door.