That would usually be called "grand theft, auto". If the bank gives a repo order, the bank is giving consent because they assert their ownership...they do hold the title. If a mechanic tows your car to another location to complete repair, that would depend on the contract. If you abandon your vehicle and it gets towed to impound because it was blocking traffic you have no recourse but to pay the impound fee. If you buy property with an abandoned vehicle, you can claim that vehicle under various statutes. You get into some scales of grey when you get into arguments of implied consent. If your garage is on fire and your neighbor drags your car out before it burns to the ground, you probably wouldn't want to charge him with theft.
call police or car towing services
find the keys
Call a locksmith or some towing company have slim Jim and will unlock your vehicle for you for a small fee.
Call a locksmith, they will come to your car. Road towing service can get in with a shim but may damage door. you can break a window if desperate. Call someone who has the extra set of keys.
How will you start the car without keys
It would depend on the damage and how it occurred. If it happened while towing or trying to retrieve keys locked in the vehicle then they are not responsible.
Probably cheaper to order a couple of non OEM replacement keys off of EBay and code them yourself.
Keys are not necessary, but is not a DIY procedure. Contact a locksmith or mechanic
PIANO
Yes
hot wire it
Hot wire it. or go to the manufacturer and get a set of keys made