src/Service/cacheService.php
public function cleanExpired()
    {
        if ($this->cacheObj && strtoupper($this->cache) == "ENABLED") {
            return $this->cacheObj->clean(\Zend_Cache::CLEANING_MODE_OLD);
        } else {
            return false;
        }
    }
public function cleanExpired()
    {
        if ($this->cacheObj && strtoupper($this->cache) == "ENABLED") {
            return $this->cacheObj->clean(\Zend_Cache::CLEANING_MODE_OLD);
        } else {
            return false;
        }
    }
clean Expired

@return boolean true if ok