Publish posts automatically dont work

I use code from plugin, but dont work…

add_filter( 'cf7_2_post_status_books', 'publish_new_books',10,3);
  /**
  * Function to change the post status of saved/submitted posts.
  * @param string $status the post status, default is 'draft'.
  * @param string $ckf7_key unique key to identify your form.
  * @param array $submitted_data complete set of data submitted in the form as an array of field-name=>value pairs.
  * @return string a valid post status ('publish'|'draft'|'pending'|'trash')
  */
  function publish_new_books($status, $ckf7_key, $submitted_data){
    /*The default behaviour is to save post to 'draft' status.  If you wish to change this, you can use this filter and return a valid post status: 'publish'|'draft'|'pending'|'trash'*/
    return 'publish';
  }