Minecraft armorstands knock you back?

I'm currently doing something with command blocks and I want to prevent an armorstand from letting the player through, like a barrier block.

Why not a barrier? Very easily. I need the armor stand between two blocks and not in the middle of a block: /

Maybe someone has an idea.

Thorn armor can be made to push you back when you hit them, which is probably very complicated.

Hmm. Unfortunately, that doesn't help me because I want to make an object that will stop the player

So in what way? Do you just want a 2x? X1 block gate or what?