Ask HN: My kayak conundrum

I've got a problem I'm hoping some of you may have a solution for. I've got a sea kayak that I store in a shed near Sydney Harbour. What I want to do is rent it out to five or so people who can all chip in x amount of money each month and get access to my kayak whenever they like. The problem with this is controlling who gets access and when. I can easily build an online app where each person can check in and out when using the kayak so the others know when it's available or not. The shed it's stored in is padlocked and has other kayaks stored in there as well. What I'm hunting for is a padlock that you can lock and unlock via a swipecard and that you can remotely give access (or deny access) via the internet. This may not be the best solution, and I am open to suggestions. Does anybody know of a product that will let me give and control access to the kayak to various people depending on their online booking. I imagine something like this already exists for car sharing services and other sharing companies, but I can't find the right solution anywhere. Any help would be ridiculously appreciated. Clark