blockedCustomer.php

<?php

class Account {

    /**
     * {@inheritdoc}
     */
    public function isCustomerBlocked($return = false)
    {
        if ($this->helper->isBlockedActive() && $this->customerSession->getIsCustomerBlocked() == 1) {
            // Close session to recreate the login.
            $this->customerSession->logout();
            $this->customerSession->start();

            $this->messageManager->addError($this->helper->blockedMessage());

            $url = $this->helper->blockedRedirect();
            $redirect = $this->url->getUrl($url);
            $response = $this->response->setRedirect($redirect)->sendResponse();

            // Stop process.
            if ($return) {
                return $response;
            }
            exit;
        }
    }
}