like brapple said, i'd look under the dash and should find the brain of the alarm. if they did a good job installing it, it'd be a little hard to find.. but with that info you will be able to find instructions and will be able to progrm your alarm. at least find out what brand it is so you can ask the manufacturer.
my old alarm used to do that, automatically locks after 30 secs.. i reprogrammed it.
