library/Rediska/Key/Abstract.php
public function expire($secondsOrTimestamp, $isTimestamp = false)
    {
        return $this->_getRediskaOn()->expire($this->getName(), $secondsOrTimestamp, $isTimestamp);
    }
public function expire($secondsOrTimestamp, $isTimestamp = false)
    {
        return $this->_getRediskaOn()->expire($this->getName(), $secondsOrTimestamp, $isTimestamp);
    }
Expire key

@param integer $secondsOrTimestamp Time in seconds or timestamp
@param boolean $isTimestamp        Time is timestamp? Default is false.
@return boolean