I build escape rooms for a living, AMA!
I work for funhaven, an entertainment facility in Canada: http://www.funhaven.com
You can find me on Twitter @pixelpatch
Edit: doors cannot be locked in our facility and we have intense fire regulations to follow. You are safer in an escape room in North America than in your own home (where fire is concerned)
edit: saw and escape are not my favorite movies but they have some original ideas!