how to use touch id to open phone
How do I use Touch id to lock/unlock my phone?
iPhone 7 Plus, iOS 12.0.1
How do I use Touch id to lock/unlock my phone?
iPhone 7 Plus, iOS 12.0.1
You cannot use Touch ID to lock your iPhone. You lock your iPhone in the traditional way - press the side button.
This explains unlocking.
how to use touch id to open phone