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I find this [type of] lock quite usable, and much more convenient thne keys:

https://www.amazon.com/Schlage-FE575-CAM-619-ACC/dp/B001RFDB...

Digital so I don't need keys, but still keeping it as simple as possible. Most have a power backup so you can power it from a 9V battery externally. I still wish it wasn't necessary to change batteries, but it's not too inconvenient given they last a couple years, timewise well worth not dealing with keys.

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We have two of those, as good as they are I wouldn't trust them on an external door[0]. The locking mechanism has to be fairly light weight due to being driven by an actuator and a battery operated one at that, which means instead of a deadbolt-like configuration it is a traditional spring Latch, which could make it susceptible to bumping or even a strong rare earth magnet. Plus the key is pretty simple.

[0] https://www.youtube.com/watch?v=X038GMKwHNw

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