Как добавить настраиваемое поле в систему регистрации клиентов в Magento 2.2?

Я попробовал InstallData.php

  use Magento\Customer\Setup\CustomerSetupFactory;
use Magento\Customer\Model\Customer;
use Magento\Eav\Model\Entity\Attribute\Set as AttributeSet;
use Magento\Eav\Model\Entity\Attribute\SetFactory as AttributeSetFactory;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;

class InstallData implements InstallDataInterface
{
protected $customerSetupFactory;

private $attributeSetFactory;

public function __construct(CustomerSetupFactory $customerSetupFactory, AttributeSetFactory $attributeSetFactory)
{
$this->customerSetupFactory = $customerSetupFactory;
$this->attributeSetFactory = $attributeSetFactory;
}

public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
{

$customerSetup = $this->customerSetupFactory->create(['setup' => $setup]);

$customerEntity = $customerSetup->getEavConfig()->getEntityType('customer');
$attributeSetId = $customerEntity->getDefaultAttributeSetId();

$attributeSet = $this->attributeSetFactory->create();
$attributeGroupId = $attributeSet->getDefaultGroupId($attributeSetId);
$customerSetup->addAttribute(Customer::ENTITY, 'intrestedin', [
'type' => 'varchar',
'label' => 'Custom Field',
'input' => 'text',
'required' => true,
'visible' => true,
'user_defined' => true,
'sort_order' => 1000,
'position' => 1000,
'system' => 0,
]);
$attribute = $customerSetup->getEavConfig()->getAttribute(Customer::ENTITY, 'mobile_number')
->addData([
'attribute_set_id' => $attributeSetId,
'attribute_group_id' => $attributeGroupId,
'used_in_forms' => ['adminhtml_customer', 'customer_account_create'],
]);

$attribute->save();
}
}