If you don't remember how to unlock your phone, you'll need to reset the phone and set up your information again:

1. Make sure you know your Gmail address and password, which you'll need when setting up the phone again. If you've forgotten them, use Google's website to retrieve them.
2. Perform an external reset of your phone.
3. Set up your phone again and add a new screen lock.

If you don’t remember how to unlock your secure folder, you’ll need to delete the folder and set it up again.

1. Go to Settings > Security > More security & privacy.
2. Tap Secure folder.
3. Tap Delete secure folder.
4. Unlock your phone (use your fingerprint or the PIN/password/pattern for your phone).

5. Confirm the deletion.