does touching the home button wakes up the iPhone 5s or do we physically have to Click on Home Button or Sleep/Wake button and then use touch id?

does touching the home button wakes up the iphone 5S or do we physically have to Click on Home Button or Sleep/Wake button and then use touch id?

What I am trying to say is that each time I have to click on the home button to wake up the iphone 5s and then it scans my print and logs me in the phone however I was hoping that by just putting the finger on the button will do the whole thing of waking up + unlocking the phone,

Can anyone please let me know if I am wrong or if I am right? since I just bought iphone 5s and I am not sure if the sensor is working or not the way it should be.