[OBSOLETE] differences between "SmartThings Classic" (the V2 app) and “SmartThings (Samsung Connect)” (the V3 app)

As of this writing, STSC does not offer any way to automate the unlocking of a lock. Just the locking of it. You can open the mobile app and see the lock listed and unlock it there. But you cannot set up to unlock it when you arrive home, or at a certain time of day, or when a specific sensor activates. You can do all of those and more with the classic app. It is unknown whether this capability will be added to STSC or not.