The installation order matters! Install and open Tasker first.
Add two more actions: the first is very similar to above, but in Secure Settings select Actions -> Keyguard - Off.
The third action sets a user-defined variable in Tasker, named NeedsLock, to 1 (check the box labeled use maths).
If no tasks appear in the list, it means you installed/opened NFC Trigger before configuring Tasker to allow outside access, so you'll need to uninstall and reinstall NFC Trigger.
Repeat to create an NFC Trigger task for each tag you want to unlock your phone-- I added an "Authenticating manicure" task and attributed it to my nail polish tag.