Any Suggestions For Easy Emergency Door Locking At a Commercial Office

I'm looking for suggestions. I have a customer who occupys two floors in a commercial building. Each has its own lobby and the doors are kept unlocked during business hours, however, they have wood doors so they can't see in advance who may be coming in and recently they have had issues with that so they would like to be able to lock the door to prevent this from happening. They would also...

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