Few options if keys are out. Insert the key and try and rock the wheel left first and back right while trying to turn the key. If this doesnt work keys out use a solvent like wd40 or something safe and spray into the ignition and leave sit before reattempting the above again. Dependant on model with the key in drop the covering under the wheel and it may be possible to turn the ignition to the on position using a screw driver from the back end of the barrel. Failing that as ford said it's a lock smith next and then bmw. Or if confident you can get a second hand ignition and swap the tumblers over if needed (involved but possible).