Key-coded restrooms: Your thoughts? We disected self-check pretty

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9. The post office in my hometown used to always have its doors to the lobby area open 24/7 for

those who wanted to check their p.o. boxes. Now, they lock all doors at the end of day when the service windows close. The personnel got tired of having to clean the lobby every morning after the homeless had spent the night - lots of debris, and apparently it smelled really bad, too.