def locked?(token = nil)
      token ||= jid

      convert_legacy_lock(token)
      redis(redis_pool) { |conn| conn.hexists(grabbed_key, token) }
    end
def locked?(token = nil)
      token ||= jid

      convert_legacy_lock(token)
      redis(redis_pool) { |conn| conn.hexists(grabbed_key, token) }
    end
@param [String] token the unique token to check for a lock.
   nil will default to the jid provided in the initializer
 @return [true, false]

 Checks if this instance is considered locked

 @param [<type>] token <description>

 @return [<type>] <description>