How can I login Magento 2 customer account programmatically
You can use “setCustomerAsLoggedIn” method to login Magento 2 customer account programmatically
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$customer = $objectManager->create('Magento\Customer\Model\Customer')->load(1); //2 is Customer ID
$customerSession = $objectManager->create('Magento\Customer\Model\Session');
$customerSession->setCustomerAsLoggedIn($customer);