How to disable/enable a product programatically in Magento2

Product enabled :

$sku = '3821'; 
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$product = $objectManager->create('Magento\Catalog\Model\Product')->loadByAttribute('sku', $sku);
$product->setStatus(\Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_ENABLED);
$product->save($product);



Product disabled :

$sku = '3821'; 
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$product = $objectManager->create('Magento\Catalog\Model\Product')->loadByAttribute('sku', $sku);
$product->setStatus(\Magento\Catalog\Model\Product\Attribute\Source\Status::STATUS_DISABLED);
$product->save($product);