Unfortunately, if you've disabled Auto-Lock, it limits your options for locking the door from the inside.
The only option other than using the app is to use a Remote control. With a remote, you can lock the door with just a click of a button.
If you decide to the use the app on your device, it is also a convenient option to lock the door from the inside. Simply open the app and tap the lock icon to engage the locking mechanism.
Even though leaving Auto-Lock turned on is recommended, you might have other situations where it will require you to have Auto-Lock turned off. Often the solution for this type of situations is Passage Mode. Please refer to this article for more information on Passage Mode.
If you have any further questions, please don't hesitate to contact us.