How to hold Magento 2 order or change the status of Mangeto 2 order to hold
You can use “setState” or “setStatus” to change the status of a order to “holded”
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$ordernumber = 1;
$order = $objectManager->create('\Magento\Sales\Model\Order')->load($ordernumber);
//Change to holded
$order->setState($order::STATE_HOLDED)->setStatus($order::STATE_HOLDED)->save();