There is no Raise to Unlock feature to enable. There is a Raise to Wake, but that only wakes the screen up. You still need to unlock the phone, either with the passcode, or with Touch ID. And you need to press the home button as well as use Touch ID to get the phone unlocked. iOS 11.1.1 was not designed to make any changes to the way the iPhone reacts to Touch ID.
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You can try the troubleshooting steps in this support document. Get help with Touch ID on your iPhone or iPad - Apple Support
So since iOS 11, it no longer works? Or are you saying that since iOS 11, it will experience a problem sometimes? You do realize that it will not work 100% of the time, since it is subject to different environmental factors that can affect Touch ID. I would be concerned if it no longer worked. If you are that concerned, then make a Genius Bar appointment and have the device checked.
Question: does not work properly unlock iPhone.