Rhetorical Question - for now ... 420 SEL unlocking door if battery is discharged

A couple days ago I found the battery of the 420 SEL was discharged - don't know the cause yet. It had not been driven for several weeks. Luckily, I am guessing, I had not locked the (vacuum-operated) doors.
So, at the moment this is a rhetorical question. This is not the best neighborhood, so ideally I should lock the car. But if I lock the doors and the battery goes out again, how can I unlock them again? Or is the battery not related to the vacuum system, and I need not be concerned?
Thanks for any comments.
Jim
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With a key?
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On 2005-03-07 21:55:03 -0800, jim snipped-for-privacy@hotmail.com said:

Either way it doesn't matter. The system that unlocks the door via your key is mechanical. At least in older vehicles...
Marty
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a rock!
THE KEY
the case, minus a few cans!
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