Are you talking about Samsung Pay PIN or your device's PIN? If it's Samsung Pay:
Did you forget your Samsung Pay PIN? Don't worry, you can still get into your account. Just reset the Samsung Pay app, add your cards again, and try not to forget your PIN next time. To reset the app, navigate to your phone's settings. Swipe to and tap Apps, and then select Samsung Pay. Tap Force stop, and then tap Storage. Tap Clear cache, and then tap Clear data. Once these steps are completed, reopen the app and follow the on-screen prompts. During the setup, you will create a new PIN and will need to add your credit cards again.
If it's the device's PIN - Then you are going to immediately attract suspicion..