What I have done so far. There is no password on firmware. Put the laptop in target disk mode. Connected a 3.0 usb-c cable to the laptop while the other end of the cable is usb and connected that into my forensic machine. The laptop does not appear in my drop down in FTK Imager to acquire the drive. Can't use Paladin because there is no usb port on the laptop. I also tried using a write blocker as well as a software write blocker thinking maybe the laptop will appear in FTK Imager, but it didn't as well. Not sure what else I should do. The hard drive is soldered onto the motherboard.  

You need an adapter that converts the USB C port on the laptop to a USB-C port and 2 USB ports. This is available from Apple (about £50) or you can get 3rd party ones that have the same capability.

Then you can boot to your chosen imaging tool (personally macquisition for this) and image it as normal

Apple one:
Here

3rd Party one:
Here

Just beware, sometimes 3rd party ones won't boot properly because Apple stuff is just a pain for playing with anything else.  

I agree with minime2k9, an adapter to convert USB-C is almost a must. In my Mac cases, I've used both Paladin and Macquisition, they both work fine.