Sorry, I misread your comment, I thought you were asking for a method other than one using lockdown mode. I doubt there’s a method using location if it isn’t provided by the manufacturer, because an app trying to do that would need permissions to lock the phone.

For almost any phone: just turn it off. Every phone I’ve used requires a passcode after a power cycle

My work phone is an iPhone and I love this feature. The moment it’s past work hours I no longer get buzzed for any notifications, and I only see direct messages on the home screen