One of my sites decided to save money by purchasing cheap door latches. These locks were cheap because they were fire suppression latches. When a fire door closes, when it gets hot enough, they have a part inside that melts, sealing the door so that you cannot accidentally access an area which got hot enough, cause flash over, and become a very crispy critter. Please note, these links are designed to melt well after everybody has escaped.
So, this place used them as regular door latches. It turns out that using the lock tons of times in a day, like say in a restroom, the metal wears out and kind of seals the door.
Needless to say, we found this one out, after the third bathroom door latch failure. By the time all of the latches were replaced, our maintenance staff got very, very good at removing the locks without resorting to crowbars, fire axes, or in the case of the first one, the jaws of life.
One of the last doors to jam had a mother and her little child, no more than about four trapped in the restroom. By then our maintenance crew had figured out how to take apart the lock and open the door quickly, you just had to be on both sides of the door.
One of the maintenance guys would climb up, and go over the wall between the areas using the drop down ceiling.
When he landed inside, the little kid piped up and said, "Spiderman! Mom! Spiderman!"
May the kids you deal with be cute and endearing.