Poppet stuck open!

HELP!

I bought a couple of used Corny kegs for a Belgian ale yesterday.
The kegs all came pressurized and I cleaned them overnight with PBW.
Reassembled them this morning and after force carbonating the first one, I have a geyser from the IN poppet after I removed the hose. It looks like it is seated correctly, but it is spewing gas and ale everywhere!

What are my options?
The CO2 rig I have is dual-guaged, so I popped the currently unused hose on there and it seems happy for the time being.

First, the brew shop is closed today and tomorrow (Monday).
Second, how am I going to get that poppet replaced without losing a ton of ale while bleeding off the pressure?!?!?!?!

Nevermind.
After reading a few other posts here on this topic, I pressed it down a few times, but it did not reseat. It did QUITE quickly run out of CO2, however!

I removed the valve , popped out the poppet, cleaned both again and put it back on. Now it is holding pressure.

Mod, feel free to delete this thread. I am not seeing how to do that.