Eruv ve`Reshuiot

I`m staying now in Germany for a few weeks for work purpose and my quesion relates to cases when No Eruv , mostly in Chutz-Laaretz. When there is no Eruv and I`m staying in Hotel which has regular door keys (instead of electronic ones) , could I exit from my room with the keys and give them to the reception person (so I would not carry them outside when going to Bet-knesset) , or the whole Hotel except my room is defined as ``Reshut Rabim`` and I couldn`t take anything out of my room ? Toda and Shabbat Shalom