Unable to get opening hours

[ohromeo]

$places = new \Biscolab\GoogleMaps\Api\Places([
    GoogleMapsApiConfigFields::KEY => $API_KEY
]);
    $results_by_name = $places->findPlaceByText($address, $params, $fields);
    $first_result = $results_by_name->current();
    $place_id = $first_result->getPlaceId();

    $candidate = $places->details($place_id, $params);

      $opening_hours = $candidate->getOpeningHours();

it appears the $open_hours is always blank, has this been implemented, or can someone explain how to retrieve this information/. test POI have the opening hours listed.