Rear flap + ceiling = What now xD?

Hi, call me back from the holiday and I forgot to remove the ceiling in the trunk during the closing process, which was half straight out… Now I have the salad, the ceiling looks half out, the trunk is closed and it reacts nothing, absolutely bombproof…Can I somehow lock the trunk, if yes how? The lock does not react on the key when I try to open the flap Manually…Do not want to use too much violence, Werkst only unfortunately the trunk is full of food, gifts, fresh as well as old clothes and especially the magnificent French cheese… … … ahhhh … !!! … and now :/? *Edit: If important, Phaeton Bj. 2008 *Search function has been used several times, only unfortunately as usual very modest results, if that ever finds anything… google that is significantly more effective.