How do I unlock an ipad pro

If you're talking about the passcode to unlock your iPad screen:

Given that to remove the existing passcode you must connect your device via USB to a computer (a Windows PC running the latest iTunes version, or a Mac, which can run iTunes or Finder, depending on the macOS installed on it), and keeping in mind that if you don't have a backup all data will be lost on that device (except those that you eventually synced to iCloud), pay attention to the specific gestures that you need to perform while connecting your iPad to the computer. These are the instructions to re-gain access to your device:

If it is an iPhone:--> If you forgot your iPhone passcode - Apple Support

If it is an iPad:--> If you forgot the passcode on your iPad, or your iPad is disabled - Apple Support

Or, watch this support video about the same matter:

https://www.youtube.com/watch?v=7s8-zLG9ySQ

If you mean something different, please better clarify your needs.

Regards

Giulio