Anyone Know Smart Locks And Automation?

A customer needs to be able to remotely (from off-site) unlock a door after visually confirming a user is authorized. It's an ancient French door, so it needs to be a mortise lock and be battery operated, and needs to work with a video intercom. Just for fun, the video intercom will be mounted to brick, so wireless and battery operated is a plus. There's no internet on site now but the customer could be persuaded to add internet and Wifi. Two or three times a month, the door will be unlocked for authorized users as well as visitors, and the facility is occasionally rented out, so the ability to temporarily disable the lock remotely is a plus. Budget is "as low as possible".

Any ideas?

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