Magento 2: Invoice capture programmatically not working in magento 2.2

Question

I am trying to capture payment online but it's not capturing. I am working with Magento 2.2. Not sure why this code does not work even the same code works with the latest version of Magento.

 public function createInvoice($order, $requireCapture = false)
 {
  if (filter_var($requireCapture, FILTER_VALIDATE_BOOLEAN) === true) {
   $captureType = Invoice::CAPTURE_ONLINE;
  } else {
   $captureType = Invoice::CAPTURE_OFFLINE;
  }

  if (!$order->getInvoiceCollection()->count()) {
   $invoice = $this->invoiceService->prepareInvoice($order);
   $invoice->setRequestedCaptureCase($captureType);
   $invoice->register();
   $invoice->getOrder()->setCustomerNoteNotify(false);
   $invoice->getOrder()->setIsInProcess(true);
   $transaction = $this->transactionFactory->create()->addObject($invoice)->addObject($invoice->getOrder());
   $transaction->save();
  }
 }