Assuming you have sortkeys-go
in your $PATH:
(defun jlo/go-sortkeys ()
(interactive)
(message "sortkeys-go -file" (buffer-file-name))
(shell-command (concat "sortkeys-go -w -file=" (shell-quote-argument buffer-file-name))))
(defun jlo/go-sortkeys-with-revert ()
(interactive)
(jlo/go-sortkeys)
(revert-buffer t t))
(add-hook 'after-save-hook #'jlo/go-sortkeys-with-revert nil t)