I see. Yeah it happens.
In regards to the "lights" have you checked the "Power Saver" settings? If you are set to be in Power Saver mode, then the lights go out right away or even off. In Power Saving mode there is option to "Restrict Performance". See if it says Enable or Disable. If it shows the option to "Disable", meaning it is on, then check it's settings. One of the settings should be for "Light Duration", for the touch keys.
The route to get to there should be... "Settings", then "Device", next "Display", and finally "Touch Key Light Duration".