docs: private boolean isExpired(RefreshObject refreshObject) {
          if (refreshObject == null) {
              return false;
          }
  
          Calendar calendar = Calendar.getInstance();
          calendar.setTimeInMillis(refreshObject.getTimestamp());
          // calendar.add(Calendar.SECOND, period.intValue());
          calendar.add(Calendar.MILLISECOND, period.intValue());
  
          Date now = new Date();
          return now.after(calendar.getTime());
      }