A magnetic latch designed to hold the door of an enclosure made with 2020 aluminum extrusion.  I've included the Fusion 360 file so that you can modify the holes for the size of magnets you have.  The Enclosure Side Latch - Improved.stl provides better support for the door when shut.

Build of Materials
6x 8mm diameter by 3mm thick neodymium magnets 
Super glue to glue the magnets in

If attaching to 2020 extrusion:
4x M4 or M5 8mm screws
4x M4 or M5 T-nuts