code: func GetTokenFromHOTPMockFile(path string) (token string, e error) {
  	otp, err := LoadHOTPMockFromFile(path)
  	if err != nil {
  		return "", trace.Wrap(err)
  	}
  
  	token = otp.OTP()
  
  	err = otp.SaveToFile(path)
  	if err != nil {
  		return "", trace.Wrap(err)
  	}
  
  	return token, nil
  }
docs: // GetTokenFromHOTPMockFile opens HOTPMock from file, gets token value,
  // increases hotp and saves it to the file. Returns hotp token value.