My mom's friend was in that situation. She had her husband's safe, he passed and didn't know the combination. No oe would open it or knew how. Her son was a millionaire.
My skill set is limited, but I can open master padlocks and simple left-right-left safes. I learned by taking them apart. I'ts a combination of feel and mathematics. Usually takes about 20 minutes and < 20 minutes to actually know the numbers.
She chose to leave it open, but not get the combination.
I haven;t used those skills in a long time. They were developed some 50 years ago when I was bored in high school and th internet didn't exist.
A suitcase that was given to us was opened after the lady passed away, I opened it on the 2nd try.
Something a little harder: Do you know how to turn the copier on after hours? No. Why do you need it? He gavea good reason, so i offered to help. I had the code in like 20 minutes.