src/Versatile/Search/ForwardsToCriteria.php
public function sort($key, $order=Sortable::ASC)
    {
        $this->criteria->sort($key, $order);
        return $this;
    }
public function sort($key, $order=Sortable::ASC)
    {
        $this->criteria->sort($key, $order);
        return $this;
    }
Adds a sort key

@param string $key
@param string $direction
@return self