Both problems are now fixed. I used the other key to get power through the lighter and by that it was possible to push the unlock button and open the trunk. I connected a battery to the old battery and started the car. But it did not start, only turnover. I had to lock and unlock with the IR key as well and after that the engine could be started. The key stuck in the door got loose after some bending and pulling. I strongly recommend you gentlemen to exercise these locks once in awhile. Also I found that the new S/class has the battery in the trunk and a additional battery in the engine room. Maybe Mercedes has learned something.