Standard equipment on my RV. Which is why I had to install locks to keep them from opening when I'm driving.
So, how did i lock 'em.... I will describe two drawers
The kitchen has a stack of 4, between the top two I put a large eye bolt..Likewise another directly below it between the bottom two.
A dowel rod passes through the eyes.
Another drawer is held closed by a bungee cord across it.
Cubbord doors with velcro around the knobs (Bi-parting doors) or hook and eye or modified hinges (I took the pin out anddrop a cotter key in to lock it.
Everything is LOCKED before hitting the road tomorrow morning.