Locked out of WordPress!

You will have to use FTP or your hosting control panel to deactivate the plugin. To deactivate it, just rename the plugin folder called “google-authenticator” or delete it. If you are going to delete, make sure you delete the right folder!
I usually just add a few letters in front of the name e.g.: xxxxgoogle-authenticator and after I’m able to login I rename it back to its original name.

Thanks Harrison, excellent advice. I just upgraded my iPhone from 5 to 5s and this process kills the connection to the plugin.