You can do this using WebCoRE or CoRE as suggested above. CoRE can’t do email but webcore can do that.
If you’re using RBoy Apps then your can check out LUM which has an Auto Relock feature and you can set the timeout in minutes and also limit when you want it to operate (which modes, e.g. Home, Away, Night etc). You can also optionally select a door sensor so it’ll only re lock it when it’s closed. It can only send Push notifications and SMS at this time (email in future): [OBSOLETE] Lock User Management (LUM)