I think a keypad would be much helpful for my guests to enter my house. some guests seldom visit my house, some of them such as airbnb travellers feel so troublesome to install and uninstall an app in short time, and some of them from overseas can not find this app in their countries' app store. although they are willing to install the app, then here comes other problems like unable to connect to the lock or no sesame lock found.
btw the auto unlock works not very well. for many times I stood in front of my door and no respond, so my roommate unlocked the door, after we came inside the house and locked the door, suddenly door was auto unlocked.