Google removed the ability to unlock Android devices with Smart Lock a couple years ago. There are apps that emulate a lock screen and allow you to unlock using NFC, but they are unsecure and most likely have a heavy impact on your battery along with many bugs. As far as I know, the only way to enable native NFC unlocking is to root your phone and edit certain files to trick your device into thinking it has already registered an NFC device, and I’m uncertain as to whether that even still works. Might be worth a shot though if you have some rooting/flashing experience and really want the functionality. Here’s a tutorial(not sure how outdated it is):
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