Hide them in plain sight
Over the next week or two, start cooking dishes with various legal commercial species, like fresh shiitake, and mushrooms other than the white button type.
Talk about them with your room-mates like you're so in love with the mushrooms you looked up online how to grow them at home.
Describe the techniques to your room-mates until they re so sick n tired of hearing about it, they tell you to STFU.
Then start growing whatever shroom you want, and point your tubs out often to your room-mates, to keep them as uninterested as possible.
I actually thought about a similar such approach. Alright, I'm gonna just give in and say that my "co-residents" are my parents. Don't know why I was so apprehensive to tell you all that.. guess I was worried about you guys disapproving of growing illegal substances in someone else's house. Oh well. Now that you fully understand my predicament, you can see why locked footlockers WON'T WORK. If they say "open that right now", I really have no choice if I wish to continue to live here and eat their food (which is nice, as being in college is 'spensive!).
Back to the hide in plain sight idea. My folks raided my room along time ago and found all my drug-related stuff: bowls, shake/seeds/stems, and a book, entitled "Psiloscybin: Magic Mushroom Grower's Guide" (I'm sure you've all heard of it). So they know that I know how to grow the good stuff. Now, in an attempt at planning such a procedure, I asked them recently if I could grow legal mushrooms. They asked why I was interested at all, and I said, "Remember that episode of Dirty Jobs we watched about the mushroom farm? It got me all excited and wanting to grow again, but I'm older and more mature and don't want to risk illegal activities anymore, so I'd like to grow the legal kind." They said it's ok, as long as they're legal... and they plan to eat some as well. This is bad.. if I'm growing illegal ones alongside the legal ones, how do I know they won't go pickin' in my patches to make dinner one night (I work evenings and would never know) and trip their balls off? I'm beginning to think it's just smarter wait 'till I'm out in my own place. "The patient man eats ripe fruit." -African Proverb