The company that makes the security keys for TOR also makes them for WoW. I got my WoW security key at the beginning of The Lich King expansion, and it's still working to this day - The screen isn't even dimming. So, that has been what, about 3 years now?
Also, for the user that was complaining about not being able to log in from work because they didn't have their security key - You should keep it on you at all times. You're not allowed to share you account, so there should be no reason not to have it on your keyring 24/7.
Yeah, put it on a chain and wear it around your neck.