how to Auto-Login in wordpress

//determine WordPress user account to impersonate
$user_login = 'guest';

//get user's ID
$user = get_userdatabylogin($user_login);
$user_id = $user->ID;
  
//login
wp_set_current_user($user_id, $user_login);
wp_set_auth_cookie($user_id);
do_action('wp_login', $user_login);
     

?>
<script type="text/javascript">

window.location = "wp-admin/profile.php";

</script>
<?php