How to make Renamed- wp-login page SSL

Hi Guys,

I use Rename wp-login.php with the HTTPS plugin for my SSL.
for instance i changed my wp-admin to
https://www.example.com/custom-login/

issue 1,
When My admin enter https://www.example.com/custom-login/, it didn’t redirect to ssl like https://www.example.com/custom-login/

issue 2
For now, my admin users can login via https://www.example.com/custom-login/

I tried to add URL filter by adding /custom-login/ but it didn’t work.

Qns 1
I saw the FAQ coding below. Will this make all access of /custom-login/ turn into auto SSL HTTPS site?

Qns 2
If yes how should I put this code, and where?

function custom_force_ssl( $force_ssl, $post_id = 0, $url = '' ) {
    if ( $post_id == 5 ) {
        $force_ssl = true;
    }
    return $force_ssl;
}

add_filter('force_ssl' , 'custom_force_ssl', 10, 3);

Thanks.

https://www.ads-software.com/plugins/wordpress-https/