Abstract: Disclosed is a protective cabinet in the form of a moveable furniture unit that has structure to enable moving the furniture unit into a locked position in which it blocks a point of ingress of a would-be assailant, such as a door or window into a space. In certain configurations, the furniture unit includes protective, hardened material, such as a ballistic material that provides increased protection against fire from a weapon, such as may be encountered in an active shooter event. For example, the cabinet may be used on a daily basis inside of a classroom, and may be moved and locked into a position in front of a doorway, window, or other ingress or egress point of the classroom during an active shooter or other threat event to both block the ingress/egress point and provide ballistic protection against weapons fire from outside of the room.