The click sound is also very dependant on the lock, the tolerances and the pin form. Very very cheap asian import products (1 dollar, 1 euro cylinder lock) have extremely rounded pins (at the shearline) to counter the poor manufacturing tolerances. Furthermore, the drill holes of pins chambers are generously countersunk. These pins 'autoset' very smoothely almost instantly without feeling at the shearline and without a notable 'click' sound, If you release tension, the pins, however, are free to move and are accelerated by the spring and suddenly blocked by the keyway - hence they click by releasing the tension.
I have such a 5 lock set of such locks for 5€. (One lock of these is however unpickable

- it doesn't even open with the genuine key!). These locks open without click sounds.
In a new clean, quality lock, however, you should either hear or feel a click.