Paralleling pins - Gasp!
Get a 5V reed relay, the one Radio Shack sells is just right, and its contacts are rated for 1/2A.
If you don't live in America, look for one with a coil resistance of 200? or so. And.. you need that diode, too, [though some have that integral.]
Or - get a transistor.
http://s270.photobucket.com/albums/jj118/new_clear_days/circuits/?action=view¤t=OSRRdemo-1.mp4