We stayed in Novotel Le Mans. The hotel was very nice however we had a horrible incident occur and was told we would receive a full refund for our stay. My dad's room key wasn't working after breakfast Saturday morning. The front desk lady came up to fix it, not even the master key would work. The sensor was completely dead/broken. We waited 2 hours she still couldn't get in the room, we were extremely late for work and said we would come back when it was fixed. We couldn't wait any longer. My dad didn't have his computer, money, car keys, jacket, nothing it was all locked within the room. We then had to call a taxi to get to work and told the front desk lady that when they do get the door sensor to work to please call us and leave the door locked as we don't want our valuables being accessible. When we came back to the hotel, our hotel room was completely left unlocked and wide open, because they said 'well we didn't know if we could get back in'. We had a lot of valuables and money and specifically told them not to, which they had confirmed they understand and still deliberately went against our wishes because they weren't sure if they would be able to get it open again. They had no one there to monitor it or anything. They said they would have the manager call us Monday for a refund and to see how they could make this up to us. This whole situation was extremely hazardous, what if there was a baby or kid trapped in the room and they couldn't get in? or a fire?