a plurality of tracks to mount to a first monument in a cabin of an aircraft;

a plurality of rods, respective ones of the rods to slidably engage respective ones of the tracks;

a panel coupled to respective ends of the rods, the rods to move relative to the tracks between a stowed position and a deployed position, the panel in the deployed position to interface with a second monument in the cabin opposite the first monument, the rods to extend between the first monument and the second monument when the secondary barrier is in the deployed position; and

a lock movable between a locked position and an unlocked position, the lock to prevent movement of the secondary barrier from the deployed position to the stowed position when the lock is in the locked position, the lock including a keyed interface provided by a first rod of the plurality of rods and a first track of the plurality of tracks associated with the first rod, the keyed interface including a protrusion formed on the first rod and an opening formed in the first track, the opening of the first track including a first aperture and a second aperture, the first aperture to enable the protrusion of the first rod to pass through the opening and the second aperture to enable the first rod to move relative to the first track in a direction non-parallel relative to a longitudinal axis of the first track.