How to get link to product image?

    // Not all the products have an image set
    if (empty($product->field_product_images->first()->entity)) {
      $field_config = $product->getFieldDefinition('field_product_images');
      $default_image = $field_config->getSetting('default_image');
      $entityrepository = \Drupal::service('entity.repository');
      $defaultImageFile = $entityrepository->loadEntityByUuid('file', $default_image['uuid']);
      $image_uri = $defaultImageFile->getFileUri();
    } else {
      $image_uri = $product->field_product_images->first()->entity->getFileUri();
    }

    $values['g:image_link'] = file_create_url($image_uri);