Simple circuit

Trying to make a simple circuit.
Open circuit
Close the circuit and a buzzer goes off for a period of time (10 seconds)
and stays off while circuit is closed (or for another set time).
Then Cycle again.
I'm building one of those carnival games that uses a hoop that you move along a curvy rod without touching it or the buzzer goes off. I'm trying to make it so the buzzer won't continue to go off if someone sets it off and walks away.

Any help would be great

tony

Use an LM555 one shot with capacitive coupled trigger.