They had electronic swipe keys for the doors, which randomly stopped working. Me and rufus unluckily had it where both our keys stopped working. No reception staff at the hotel, and I couldn't ring the number left with my UK mobile.
The number they left didn't work either, no-one answered.
I was locked out as well and debated whether or not it would be justifiable to kick the door in. In the end, I drove back home for that night (perhaps not the wisest idea, but after trying to get in for 30 minutes I was more or less sober).
Before I left, I did mess up all the paperwork I could find on the reception's desk however, and put everything in a different order or in a different spot. Must have taken them some time to sort out.