loggin out automatically

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I am considering writing a little program to control the amount of time a
certain user is allowed to access a Linux system i.e. 10 minutes, 1 hour,
etc.

I was wondering if there might be any complications with a line like:

os.system("logout")

Would :
    The python interpreter wait for the call to return and refuse to die so
the call would fail?
    Or: would some other complication I haven't thought of stop this
working?
    Or: would this work fine?
    Or: am I an idiot?
    Or: some combination of the above?

Many thanks for any helpful and / or amusing replies.

Best regards,

M