Restrict Non Admin User To Home Page of WordPress Site

restrict_admin_panel_for_non_admin_user.php

<?php
if(!function_exists("redirect_non_admin_users")):
/**
 * Redirect non-admin users to home page
*/
function redirect_non_admin_users() {
	global $currentUser;
	if ( is_admin() && ! current_user_can( 'manage_options' )
	 && '/wp-admin/admin-ajax.php' != $_SERVER['PHP_SELF']
	 && ! ( defined( 'DOING_AJAX' ) && DOING_AJAX ) ) {
		wp_redirect( home_url() );
		die();
  }
}
add_action( 'admin_init', 'redirect_non_admin_users' );
endif;