A few months ago I left my cars key in the trunk and closed it and doors were already locked. Found a key maker but he demanded 3,000 rupees plus said there will be some scratches in window area in the process. Car was parked outside my previous office so left it there, took the cab to my office and called a friend who lives near my home and he was coming to office in second shift, brought my keys.
Since then keeping a key in purse and one in office.