code: func (o *MockOracle) IsExpired(lockTimestamp uint64, TTL uint64) bool {
  	o.RLock()
  	defer o.RUnlock()
  
  	return oracle.GetPhysical(time.Now().Add(o.offset)) >= oracle.ExtractPhysical(lockTimestamp)+int64(TTL)
  }
docs: // IsExpired implements oracle.Oracle interface.