(B) by a drop bolt system operated by placing a central metal plate over a metal doorjamb restraint that protrudes from the doorjamb and that is affixed to the doorjamb frame by means of three case-hardened screws at least three inches in length. One-half of the central plate must overlap the interior surface of the door and the other half of the central plate must overlap the doorjamb when the plate is placed over the doorjamb restraint. The drop bolt system must prevent the door from being opened unless the central plate is lifted off of the doorjamb restraint by a person who is on the interior side of the door. The term "keyless bolting device" does not include a chain latch, flip latch, surface-mounted slide bolt, mortise door bolt, surface-mounted barrel bolt, surface-mounted swing bar door guard, spring-loaded nightlatch, foot bolt, or other lock or latch; or