Hide the admin panel from users without certain capabilities.

hide-admin.php

<?php

/**
 * Disable admin bar on the frontend of your website
 * for subscribers.
 */
function themeblvd_disable_admin_bar() {
    if ( ! current_user_can('edit_posts') ) {
        add_filter('show_admin_bar', '__return_false');
    }
}
add_action( 'after_setup_theme', 'themeblvd_disable_admin_bar' );

/**
 * Redirect back to homepage and not allow access to
 * WP admin for Subscribers.
 */
function themeblvd_redirect_admin(){
    if ( ! defined('DOING_AJAX') && ! current_user_can('edit_posts') ) {
        wp_redirect( site_url() );
        exit;
    }
}
add_action( 'admin_init', 'themeblvd_redirect_admin' );