Here is a retrofit app smart lock that lets you use your fingerprint to gain access to your home. The Securaki Biometric Lock can be installed in about 5 minutes. It has enough memory for up to 100 fingerprints. You will also be able to unlock your home with the Securaki app.
This smart lock is compatible with Alexa, Google Home, and Apple HomeKit. The companion app lets you see past lock and unlock events. You can install this lock easily thanks to its self-adhesive backplate. The fingerprint scanner has a rain cover built-in.[where to find it]