Timed wall toggle for CS:CZ How is this done?

I am currently making a fightyard map and want to include walls that, when triggered, will trap players for 3 seconds. I have tried different combinations of func_button, func_relay, trigger_multiple and trigger_counter. Either the walls dont turn on at all, or they turn on but wont toggle back off.

The kicker is that I did something similar to this years ago, but can't for the life of me remember how I did it.

use multimanagers to facilitate the timing of the wall.

you can also use func_wall_toggle