A jamb bolt is an easy way to lock pocket doors.  It is installed next to the pocket.  When the dot is pushed, the face flips out like a light switch toggle.  This keeps the door from sliding into the pocket.  There is a small strike plate for the door frame and a small open gromet to trim out a hole passing through the door.  The hole allows a sharp object when pushed to unlock the door.
 
Finishes are shown in order: Unlacquered Brass, Brushed Chrome, Satin Nickel, Polished Chrome, Flat Black, Polished Nickel, Antique Nickel, Oil Rubbed Bronze, Antique Brass, Brushed Brass, and Polished Brass.