The alarm on the car was set but the remote broke and won't turn the alarm off

I hate to say it, but you need it checked by a dealer to confirm what the problem is. They have the proper test equipment. Anything I would say would be a guess.

Try turning a key in the door lock cylinder in the unlock direction, There is a switch on the door cylinder that should disable the content theft deterrent alarm. Here is the hitch, if that switch is malfunctioning, it may not work. I don't remember if there is a passenger door lock cylinder, but if there is and the driver doesn't work, try the same procedure in the passenger door.