How to load current user cart in Drupal Commerce 2.x

$store_id = 1;
$order_type = 'default';
$cart_manager = \Drupal::service('commerce_cart.cart_manager');
$cart_provider = \Drupal::service('commerce_cart.cart_provider');
$entity_manager = \Drupal::entityManager();
$store = $entity_manager->getStorage('commerce_store')->load($store_id); 
$cart = $cart_provider->getCart($order_type, $store);
$cart_total = $cart->get('total_price')->getValue()[0]['number'];