Alarm will not stop going off

My kids set off the car alarm and I do not have any keyless entry remotes. Can any one tell me how to reset the alarm with out a remote. The car will not start and the horn will not stop going off...

Please Help....

Put the key in the driver's door and unlock it if you have the OEM alarm

What you do is the you open all the door by hand lock them by hand close the doors then get the key drive side turn it to open then to close then to open, open door try to turn on the car if it start there you got it if it doesn't work then it something other ???? what car is it?