Screen is frozen at enter pass code screen,and touch screen not responding

Whoever set up your Wi-Fi should know that. Same passcode should work for any device on your Wi-Fi network.

If your iPhone iPad or iPod touch doesn respond or won turn on

I find this happens to me sometimes as well.
The screens are capacitive touch sensitive which means it responds to the small amount of electricity on your skin. If your fingers are damp, from sweat, high humidity, then the capacitance will not reach a level for the screen to react to.
Keep your fingers dry and keep the screen very clean and free of oils.

Try these two simple methods: Troubleshoot Your Nook Frozen Screen With 2 Simple Methods
you can also call call Nook Customer Service Number @ +1(844)-305-0086 (Toll-Free).

First try and hold the power button down until it switches off and then turn it back on and see if you can unlock it.
If you can't unlock it then you can do a recovery this is how
when it is switched off hold the volume up and the hold the power button until you see a recovery screen with options there you will see a option to recover.

If possible I would suggest calling customer service cause it sounds like your touch sensor is broken. If you are within the warranty they will send you a new one

Turn the tablet all the way off, press and hold the VOL - and power at the same time for 8 to 9 seconds, it will show a green android guy with a system recovery menu. Use vol - to go down to Wipe Data/Factory Reset, press the power button to select it, go down to 'yes' to confirm, press the power button to select it, it will wipe the tablet, you then press the power button on 'reboot system'.

Hold the power button down for up to 15 seconds or until the screen turns off. This is considered a hard reset on most tablets.