Generally speaking, you could just add it as another layer of security for proximity-based interaction as a three-factor authentication of sorts. For instance,

Generally speaking, you could just add it as another layer of security for proximity-based interaction as a three-factor authentication of sorts. For instance, people can't open X without (1) a key/password, (2) a OTP password, and (3) an NFC device. It seems like a good way to add a proximity factor to authentication. It doesn't have to replace something; it can also augment them. Especially when it's an automated process, not a manual one.