bhushan007 Said:
"Keyboard issue: Hi, I am using 15-inch, 2016 Mac book pro. I am facing issue regarding to some keys on keyboard. I even showed it to apple care. they said as my MacBook is now out of warranty they are not able to do anything.[...]"
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Reset the SMC and your NVRAM:
Sometimes when changes are made to the system(i.e. uninstallations), system configurations (i.e. for the keyboard) become manipulated, technically. So, reset the SMC and NVRAM. Try performing each thrice. It may take sometime, being certain you have the time to perform these resets.
Use An External Keyboard:
If using the builtin keyboard does not work properly for entering the password, then use an external keyboard so do so. It doesn't have to be Apple brand. You might need this adapter: USB-C to USB A Adapter - Apple