aytee

<?php

namespace Drupal\commerce_product_restriction\Plugin\Commerce\ProductRestriction;

use Drupal\commerce_product_restriction\Plugin\ProductRestrictionPluginBase;
use Drupal\commerce_product_restriction\Plugin\ProductRestrictionPluginInterface;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;

aytee

Generic:
// Get all users with email containing "xyz"
$query = \Drupal::entityQuery('user')
  ->condition('mail', "XYZ", 'CONTAINS');
$uids = $query->execute();

// Load these entities ($uids) in our case using storage controller.
// We call loadMultiple method and give $uids array as argument.     
$itemsToDelete = \Drupal::entityTypeManager()->getStorage('user')
  ->loadMultiple($uids);