Has anyone seen a Zigbee plunger switch anywhere? I'm looking for a very compact one to try to detect when a conventional U.S. sliding door lock is actually locked.
that's in interesting use case - I know with a deadbolt you could use a recessed door sensor (assuming you have the clearance to drill a hole deep enough) but just thinking of how that hook latch works on a sliding door - that's a tough one.
How about a tilt sensor on a stick - you know know the real lock 
LOL
Why not connect a non-smart plunger switch to a sensor with dry contacts? I've used contact sensors and leak sensors for this.
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I’m aware that I could kluge up a solution, but I have a WAF factor to take into account. Accordingly, I was hoping for a nice commercial solution.
I’m currently working on a “prototype” that uses an Aqara magnetic contact sensor (very small) and a homemade “plunger” with a magnet affixed to it that is lifted by closure of the locking mechanism to be in proximity to the contact sensor.
maybe a "micro" switch instead of plunger? here's some inspiration toward the end of this thread https://www.reddit.com/r/homeassistant/comments/105qbni/zigbee_deadbolt_lock_sensor_state_only_no_remote/
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Yup - that's the sort of thing that I had in mind. There are also mini-plunger switches available.
It is certainly possible engineer this such that it is largely unseen.
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Not sure what type of sliding door you have, but posting this link in case it helps:
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I saw the Pella solution, which was the inspiration for looking for a solution for my sliding door -- the lock of which is significantly different from a Pella, thus not allowing the same solution (no clearance for the sensor, no way to embed a magnet within the lock-lever).
