public function createFooterMenu($menuName, $classes = '')
    {
        $menu = $this->factory->createItem($menuName);
        if ($classes) {
            $menu->setChildrenAttribute('class', $classes);
        }

        /** @var $mainMenu Menu */
        $menuIterator = $this->getFullMenu($menuName);

        if (!$menuIterator) {
            return $menu;
        }

        $startDepth = 1;
        $menu = $this->createMenu($menu, $menuIterator, $startDepth);

        return $menu;
    }