Unlock the door to work shop, hands free, when hands are full.
I am looking to have a way to unlock the door to my work/ wood/ hobby shop in my back yard with technology similar to that which has been used in some newer vehicles, whereby the trunk is unlocked and opened when the user places their leg under the rear bumper when they have their hands full. I don't know how this works, and I haven't heard of any possible problems with this technology. I'm assuming the user has some device carried on their person and there is some kind of proximity sensor or similar. I would be willing to carry what ever might be needed in my pocket at all times, just as I normally carry my wallet with me at all times. A fob of some sort, a card in the wallet. I just don't know how this works. I would like to also have a way to unlock the door should I ever forget the needed device, or in case of possible power outage, etc. Thank you all for any ideas you may have.