Drupal 8 generate style derivative image

snippet.php

// can be runned from the Devel execute PHP page
use Drupal\image\Entity\ImageStyle;

$path = 'public://2018-03/26756519_10155441271337695_6783993404862700965_o.jpg';

$thumbnail = ImageStyle::load('article');
dpm($thumbnail->buildUrl($path));
$dest = $thumbnail->buildUri($path);
dpm($dest);
$created = $thumbnail->createDerivative($path, $dest);
dpm('created? ' . $created);