No WordPress Dashboard Access

no-wp-admin.php

add_action( 'init', 'no_wp_admin_for_lesser_gods' );
/**
 * This will redirect anyone without an administrator
 * lever user to the front of the site. No Dashboard for them.
 * 
 * @author Remkus de Vries
 * @access public
 *
 */
function no_wp_admin_for_lesser_gods() {
    if ( is_admin() && ! current_user_can( 'administrator' ) ) {
        wp_redirect( home_url() );
        exit;
    }
}