Doors that locked when you don't have a certain buff/ other

Okay I'm making a underground bunker and I would love to make a door that locks when a sim doesn't have a certain buff [in my case if the sim doesn't have a buff that indicates they've showered (aka decontaminated)] or a door that makes a sim want to go shower/ or something like a proximity buff, makes sims want to take showers. 

I know next to nothing about making mods. So I'm not sure how difficult this is or if it is even possible. Anyone willing to help out by pointing me in the right direction.