Drupal 8 - Get a field from a paragraph in template_preprocess_node()

Drupal 8 - Get a field from a paragraph reference in node preprocessing

if($node) {
    // we have a node, so use headline in hero, or fall back to node title
    if($node->field_hero_section && $node->field_hero_section->getValue() && $node->field_hero_section->getValue()[0]) {
        $paragraph = $node->field_hero_section->getValue()[0];
        $paragraph_entity = \Drupal\paragraphs\Entity\Paragraph::load( $paragraph['target_id'] );
        return $paragraph_entity->field_headline->value;
    } else {
        return $node->getTitle();
    }
}