When the keyboard of your Asus laptop is not working try doing this:
Press every key on the keyboard and see whether all the keys are not working or only some keys.
Try restarting the laptop, generally when something goes wrong on your laptop, if you do a restart the laptop would start working properly again.
The last option is to open the OneNote. Then keep on pressing one key for a long time, if you are able to type in any key, then do this. Go to Ease of Access settings and check whether the filter keys are enabled. Then disable the filter keys. Your laptop would start working like before.