Its not a locking blade but very sturdy spine. I like the Case Sodbuster Jr (pardon the sales link, no affiliation)

Its a basic, CLASSIC, American blade that has been around for a 100 years and carried by probably most of our grandparents. I'd also recommend the Barlow Knife (another great blade for a kid).

I really do think, like most people have stated, a first blade/knife will be memorable, give him something that stands the test of time as a classic.
_________________________
Don't just survive. Thrive.