In 1942, Malcolm X worked for Shaw’s Jewelry Store as a porter-messenger (http://brothermalcolm.net/mxtimeline.html) He began work after coming home from Boston, and worked there for four months starting in November of 1942.
[updated Aug 18, 2017 by John Aerni-Flessner]
Shaw's Jewelry was located at 110 North Washington Ave in Lansing. Its phone number (in the old system) was 4-3000.
Malcolm's older brother Wilfred is listed in the 1940 Lansing City Directory as also working at Shaw's as a "porter," (though his name is misspelled as "Wilford").