I was trying to get past an MTF Agent by letting him see me then darting into the containment chamber for SCP 012 (On Mount Golgotha) while wearing the jade ring. I got him to approach as close to the door to the inner chamber, but a few seconds after he stepped away the door closed, trapping me inside. Would be nice if I could have lured him in and let him off himself, but I am the type to use this take care of every MTF on the map.