We had that happen to my husband and I years ago. He had cleaned our room, said goodbye and left. We didn't notice he locked the door, probably out of habit. Neither of us had our phones. We had to yell to the people above us, which lucky for us was where the buffet was. A lady heard us and said I will go get help. Then she asked us if we wanted her to throw us a banana in case we were hungry(it was breakfast time). Security, our room Stewart and the hotel manager came to our suite. They were all so apologetic but we just laughed and said we were fine! They continued through out the cruise to check on us!