Smart locks best brand

Yale conexis is a reliable lock. If you buy the correct module to go in it (3 available ) you can then link it to a smart things hub which will then link to Alexa or your phone via the Yale app

Paxton is a very good quality brand you could have a switch 2 which you program a code and access via a 4-5 digit code and the keypad releases a mag lock or release a mechanical door keep for time set usual 7 seconds Kindest regards J Thomas Leaf security

In my opinion the Samsung smart lock is better. Cooperates with Alexa and other plus you can open the doors with Your phone(NFC must be active)

I don't like smart locks. I've had to gain entry several times on a Yale smart lock as the lock has failed and access has been sometimes difficult and can be costly.

Yale Conexis L1 is a good one. They used to have a model with a keypad, but has been discontinued. Conexis L1 by default connects to your phone using Bluetooth, but you there are modules to connect it to a ZWave smart home network, WiFi network and Yale alarm systems (only one module can be installed). The integration with Alexa requires additional hardware - such as Samsung SmartThings hub. I like a lot Danalock v3, which works with European cylinders. Again, it works by default with Bluetooth. It is fitted on top of your existing lock, which is not replaced.