Samsung has changed their design philosophy for security devices in between the classic app and the new “smartthings ( Samsung connect)“ app (STSC).
What you’re describing is very easy to do in the classic app. But now in the new app, STSC, you can no longer automate the unlocking of the door or the disarming of the security system. They want you to open the app and use that.
You can use both apps at the same time if you want, and many people do for exactly this reason, but they have told us that the classic app willbe going away eventually, just not yet.
See the following FAQ (the topic title is a clickable link)
