Check out this new product. It's a ring that allows you to login to websites/web services, open locked doors or make consumer purchases in a more secure way than a password, key, or proxy card.
https://tokenize.com/?gclid=CPKE9JrW49QCFdS3wAoduLUO2g
My humble opinion, much more secure than any of the above.
Passwords - Password cracking is difficult, but far from impossible. Many apps are available to make this easy enough for the neighbor kid to break into your wifi and email...
-Password cracking tools - https://www.concise-courses.com/hacking-tools/password-crackers/
Key Locks - the art of picking locks goes way back. It's not that difficult to rock a lock open (kind of fun, like playing with a rubrics cube...). Also, ever seen a bump key?
-Lock pick training sets - https://www.amazon.com/slp/lock-pick-kit/m9tq5vyp5w2g574
-Bump key -
Biometrics - Biometrics have always been suspect to me. Within months, people were hacking fingerrpints when biometrics first came out. If a secret / item is important enough, biometrics will simply lead to severed fingers and gouged out eyeballs. (gross I know, but you get my point)
-Fake fingerprint - http://www.instructables.com/id/How-To-Fool-a-Fingerprint-Security-System-As-Easy-/
Proxy / NFC - Vulnerable to card reproduction or NFC MitM attacks.
-Proxy Card Cloning - https://blog.getkisi.com/copy-clone-prox-hid-id-card/
Final Thoughts - All that being said about it being much better, it's still not a viable solution for significant secrets OR high value items...