How to open my phone if I forgot the pass code

You will have to restore the iPhone to remove the passcode. After that you can restore it to your latest backup and create a new passcode. See the instructions here, If you forgot your iPhone passcode - Apple Support

You won't lose the data if you have a current backup of the phone which you can use to restore the phone.

See this link and follow the instructions provided

If you forgot your iPhone passcode - Apple Support