i would like for there to be a button in my map but not until something else happens so i was thinking maybe i could get a wall and then after say a cube presses a button once the wall rotates around with a button on it

for example ( i know its a bad drawing)

360 degree rotating thing: func_door_rotating.
You can also choose to have a couple of panels moving out of the way.
Or you try to find a way to block the button before.
Personally I prefer never to hide test elements because I think it should always be clear what elements you can use for a test. So I'd try to use another way to block access to the cube but that's just my $0,02

https://developer.valvesoftware.com/wiki/Panels_Rotate