I haven't logged onto my blog for years, and have, of course, forgotten the password. I click the 'Forgot' button and get a mail with a link, but that mail already says
Sorry, that key does not appear to be valid.
And sends me round the click to reset, receive a mail, click the link again etc. As if the timeout for password resets has been set to 0.5s or something.
This is a shared hosted blog, so I have full access to cPanel and all of the WP files via FTP, if that helps anything.