I dunno about LXDE but with Openbox if I mess up my autostart file I use the virtual terminals <Ctl>-<Alt>-<F*>
With that you must know F1 is xorg logging termnal and F9 is the GUI so use any other virtual terminal and use the pkill X command.
With Openbox <Ctl>-<Alt>-<Del> it brings up a singe instance of the task manager.
If you can open a terminal, $ openbox --exit
will close the session and exit to your display manager or console prompt. Unless it has been disabled in LXDE, it should also work.
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