It is secure only if no one uses it. 🙂 From http://www.dilbert.com/comics/dilbert/archive/images/dilbert2007113333116.gif. And one more with biometric scanner: From http://www.dilbert.com/comics/dilbert/archive/images/dilbert2007111111117.gif.
Scott Adams and Dilbert have very good strips on security: Be on the lookout for any suspicious behavior and If you see someone without an ID badge. Funny stuff. Enjoy.