The jack is my 2nd choice.The doors have most likely been replaced and lock barrels not been changed that’s why the key will not work.
A lock smith may be able to pick the lock.
As someone suggested earlier, dig down under a wheel or under a sill and get a low profile jack then get access to the starter and attach jump leads.
I've just had delivered a low profile electric jack. Even if to get it high enough to slide underneath. I'm praying today is a success, its been sat still 5 weeks

