My idea is that when the corrudor entrance block is right-clicked or powered by redstone, it opens/closes the door. This would change the block to be able to be walked through, and disable the door part of the texture. The block could become transparent (carpet/the old piston_extension block).

A second idea is that is is just was a transparent block to start with, reducing the amount of code.

How do we use the block right now?

 You place it down, and it renders a model. It also stops you from walking unless you jump over or walk around

Oh so it's not like an actual corridor entrance then.

 Currently, it is purely aesthetic.

 Okay thanks.

I think it should have a tag on it like some items have (WIP) it should say (Decor.) or something like that.

Yep.

 Or better: put decorative items in its own creative tab.