Hi there. Schlage locks have a fixed auto lock interval of 30 seconds. Yale and other locks have the ability to adjust this timeout which is what you’re setting in the settings page. You can find details about lock specific features in this post.
If you would like to use a custom interval you can disable the auto lock feature on your lock with this device handler using the Classic app and clicking on the auto lock tile and then use a SmartApp like LUM or RLA to set the auto relock option with a custom timeout in minutes (from the Door Open/Close settings page).