I'm looking for a timed relay, about 30 second delay. I dont know what its called, i just know what i want it to do, looked around google but i couldnt find anything that iam looking for.

what i want to do is, i got my car alarm installed but i want to put in a feature where if the alarm gets disarmed by accident in my pocket, i want it to lock the doors again if it doesnt sense the doors opening within 30 seconds. kind of like how alot of factory alarms are.

there is passive arming with the alarm but that is not what i want, since sometimes it can lock the doors with the key inside.

so, it'll greatly help me if someone can find what iam looking for.