the Shabbos key

There is a cute crowdfunding campaign on Headstart for a "frum" device. It is a device that will solve the problem of magnetic key cards in hotels on Shabbos.

I just want to know what happens when the hotel manager or an employee walks down the hall and see one of these attached to a door. Will they call the police? Will they simply break it? Will tehey assume crime or terrorism?

Here is the link to the campaign, and here is the promo video:

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