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Smart Lock without Phone Home
(partizle.com)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Pretty much any Z-Wave lock like from Kiwkset, Schlage, Yale, etc. will do what you need provided you have a Z-Wave interface to HA already. No phone home for those devices.
I will comment that the yale version 2 required an app(setup via Bluetooth), which I was less than thrilled about. But I just removed the app when done and just use my zwave.