I can't specifically recommen d one - but there are so many it seems it would be easy to find.
Tumi is a good brand, as well as samsonite. I just bought a new Samsonite for my tiny laptop - but it does not lock.
I assume you mean a carry-on. You can always buy TSA approved locks - just probably a good idea to take them off when going through security.
I am the editor, but I also speculate, ask questions and play devil's advocate. I reserve the right to change my mind.