[xmonad] additionalKeys: do two tasks?

hello, I have this in my xmonad rc: `additionalKeys` [ ((mod4Mask, xK_z), spawn "/usr/local/bin/xscreensaver-command -lock") ] that locks the screen with my meta-z and works fine. But I now want to switch to workspace 1 before I lock the screen, no matter what workspace I am in. How can I get additionalKeys to do this compount command? thanks, Alex