mine already has a similar latch as what dstankov links to. A bit heavier duty one too.
The weight of the thing is just too much for it.
I have a surface bolt, leftover from some long ago project, that I have been intending to install, but still have yet to think of it when I have time....
something similar to this
https://www.amazon.com/Prime-Line-Pr...s=surface+bolt