I was getting bored of doing this doors:


So i decided to create this one:

 

The door doesn't move at all, the player is pushed using pistons and Slime Blocks to get you to the other side. The insides are really complex but it's definatelly worth it becasue its really fun to see it working It took me about 40 - 30 mins to get to this functional model and I'm sure it can be simplified and compacted more but this is what I could come up with.