Do Samsung finger scanners constantly use battery if you keep your finger on the sensor without needing to scan anything?

I'm using the Samsung A32 5G. It has a finger sensor that allows the phone to be unlocked, I'm wondering if the phone is on and you constantly keep your finger on that sensor, will it continue to try to pick up a fingerprint and use up battery, or will it only use battery when it is actively asking for a fingerprint to be scanned? Do you not have to worry about leaving your fingerprint randomly on the sensor which could waste battery?