i have the Century lock connected to SmartThings and set to automatically lock and unlock using my Nexus 4 (soon the 6)presence. i thought it would lock when i disconnected from wifi, but it takes about 10 minutes to lock. unlocking happens about 2 minutes away, when i’m at the bottom of the hill. i wondered if it could lock quicker than that, the same time it unlocks? someone watching could find that the door is unlocked for a few minutes after the last person leaves.
I don’t think ‘presence’ will ever offer the timing you’re looking for. Since you’re on Android, consider setting up endpoints for your locks, and a wifi connected profile using Tasker to trigger those endpoints.