Hi Wesley,
I will be helping you with this issue. Have you made sure to have an active Enable Input node with a player controller node connected? Can you give me an image of your blueprint?
Is this related to what you are attempting to accomplish? https://rocket.unrealengine.com/docs/ue4/INT/Gameplay/Blueprints/Tutorials/AutomatedDoor/Part_5_UsableDoor/Door_5_01/index.html
It covers establishing key input and then how to use it. The next page has more information too. Please let me know if this has helped.
Thank you,
Alexander