wp-cron-delete-post

// delete specific post(s)
function wt_cron_delete_posts() {
  // wp_delete_post( int $postid, bool $force_delete = false )
  wp_delete_post(1);
}
add_action( 'wt_delete_old_posts','wt_cron_delete_posts' );

$args = array( false );
if ( !wp_next_scheduled( 'wt_delete_old_posts', $args ) ) {
  // time() + 3600 = one hour from now
  wp_schedule_single_event( time() + 3600, 'wt_delete_old_posts' );
}