I'm still playing with seeing if WAP can be set to even lower power or I can set RSSI threshold for individual clients high enough to disconnect one I leave the building.

If all that doesn't work, I will simply run the power to WAP thru a relay and set logic to cut power when shed is armed.

I also already have a 10 minute logic timer for my music.
Triggers include:
- Timer (re)start when any shed door is open
- Timer (re)start after last PIR secure event

Works great for music and I can't see why it wouldn't do the same for the WAP.
I even have line where music shuts off when I press LightOff button. I use that at end of day so lights don't stay on anylonger then they are needed. I could easily add the WAP relay off line to that.