I want to press E key to open door… 
hi calewell.
to achieve this, you ll have to add a trigger volume in your door BP to trigger to know if youre player is close enought to open the door. set a bool to true when your player enters the volume : like this :
then create an input called “use” in your project settings,
and call it in your blueprint like this :
it will trigger a custom event (here i called it open door) when e is pressed and the players is close to the door
then disconnect your "on begin play from your timeline, and replace it by the custom event you created.
it should work like this !