I am trying to get the custom attribute vales from products collection as like below code but i didn't get attribute values.
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$productCollection = $objectManager->create('Magento\Catalog\Model\ResourceModel\Product\Collection')
->addAttributeToSelect('cb_city');
$collection = $productCollection->create()
->addAttributeToSelect('cb_city')
->load();
print_r($collection);