A classroom function lockset is controlled by using a key in the outside cylinder. The inside lever always provides free egress. The outside lever can be locked or unlocked only by someone with the key. There is no pushbutton or thumbturn on the inside that could be used by a rowdy band of 7th grade seamstresses. This function is not just for classrooms…it can be used in any location where control over the locking/unlocking is more important than the convenience offered by a pushbutton or thumbturn (office function).