The auto-lock function is set on a timer from the app. The timer starts whenever the door is unlocked and will automatically lock itself again once the timer expires. The Ultion Nuki also features a Night Mode. Just set the time it should start at night and the time it should end in the morning. Then, it will automatically lock at the start of Night Mode and enable energy-saving mode until the morning. The auto lock can also be set to work only during Night Mode if you need to keep the door unlocked during the day, for example, if you’re a business owner. You can even set schedules to lock and unlock at certain times.