Minimum User ID

I added the following to my function.php file to allow the maximum user ID to be 999999

add_filter( ‘dfx_random_user_id_max_id’, ‘custom_max_user_id’, 10, 0 );
function custom_max_user_id() {
return 99999;
}

How can I also make the minimum user ID be 10000?
This way, all user IDs can be 5 digits.
Thank you.