How to unlock Apple 13 phone

Which lock exactly?

SIM locked => Ask the carrier that locked iPhone to unlock and if you qualify

Passcode locked => If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

Screen Time locked => If you forgot your Screen Time passcode - Apple Support

Activation locked => How to remove Activation Lock - Apple Support

(1) Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:

• Press and quickly release Volume UP button
• Press and quickly release Volume DOWN button
• Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF). 

(2)  If the above does not work then - Follow the instructions in this article by Apple ➔ If your iPhone is Non-Responsive or Frozen and see if that helps.

Axel F.