Assuming by model you mean pattern or code? Have you registered biometrics/face on the device? The settings are under Settings - Lock Screen.
You could try this:
Samsung Galaxy A71 Unlock with Google Account
Turn On your mobile.After the number of unsuccessful attempts on your mobile to unlock the device.Next, you will see the Forgot pattern option.Tap on the Forgot pattern option.Now you should be able to enter a backup PIN or your Google account login.