Peter,
 
I can't be sure, but you might check out the description of "The Biggest
Bundle of Them All" (1968) in the Motion Picture Guide.  It doesn't mention
your scene, but this is the first and only wacky heist movie with Robinson
I could think of.  It was an Italian production starring Vittorio De Sica,
Racquel Welch and Robert Wagner... sound at all familiar?
 
Jeff Clark