Play unlock cycle
Manual / key pull
Reset
Locked
◀ door opens
key
knob
spring latch
LINEAR SERVO
slot (lost-motion)
slider lever (pull ← to open)
◀— pull
slider lever
servo + link
pin (free in slot)
spring latch
1 · Locked
Spring latch holds the door.
2 · Retract
Servo pulls the lever left.
3 · Held open
Latch held — you open the door.
4 · Release
Door open, servo lets go.
5 · Auto-lock
Door shuts, latch re-locks.