Creating an ‘authenticate’ filter

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What should the ‘authenticate’ filter(s) return for the login process to be aborted? Looking at the code on Trac, it looks like I can return an instance of WP_Error. But all I get when I do that is that the login process is successful and the user is logged in (correctly).

I setup the filter hook like so:

add_filter( 'authenticate', 'my_auth_check', 10, 3 );

And then in my_auth_check() return:

return( new WP_Error( 'invalid_username', 'The username is invalid' ) );

And this seems to have no effect whatsoever.