There are a number of different keypad locks that will work with smart things. None that allow you to touch your phone to the lock, but if you’re OK with physically entering the code on the keypad, you can trigger something based on which code was successfully entered. ( the official integration doesn’t recognize individual codes, but there are very popular community – created options that do allow for codes management.)That would probably be the simplest.
As an alternative, you can try the smartthings brand arrival sensor, which has a much smaller range then a phone. Typically 20 to 50 m and each is recognized uniquely. The only problem with that device is it just doesn’t work for everyone as it can be subject to Wi-Fi interference.
A similar idea that may be more reliable but takes a little more set up is to use an I beacon. I use this my house to cover a range of about 10 feet so that it captures my arrival right at the base of the wheelchair ramp at my front door.
So there are definitely things that you can try that will handle presence in different ways.
