public function addMany(array $items, $minutes)
    {
        $values = $this->getMany(array_keys($items));

        $fill = Arr::where($values, function ($key, $value) {
            return is_null($value);
        });

        $items = array_intersect_key($items, $fill);

        $this->putMany($items, $minutes);

        return array_map(function ($value) {
            return is_null($value);
        }, $values);
    }