Took my Mac to an authorized service tech. When I described the issue the tech immediately knew what the problem was. If your Power button is still working but the rest of the keyboard and trackpad isn't working, which was my issue, the tech told me that there is a cable that links the keyboard with the trackpad that is bad. This is separate from the power button and if the power button doesn't work then the top case needs to be replaced. He said that the bad cable is a common issue with the 2015 MacBook but only with the 13 in screen. Cost was around $150 total to replace the cable and computer is working fine again. Hope this helps anyone else with this issue.