For many years the standard classroom function locksets have been installed in all schools. That is until recently. Before I explain the new lockset function let me tell you how the "classroom function" worked. A "classroom function" locks will have a key lock on the outside of the door, and the only way that you can lock the door is by going outside. The door will be able to be unlocked from the inside. This classroom function has been redeveloped because it actually has been putting the teachers into danger. If there was a fire or a gunman in the hallway the teacher is going to be put into harms way. The development of the dual cylinder, exit/entry function lockset is the solution to the many concerns that the parents, teachers and employees of school districts across the country.