When you click right mouse button on graph editor, you can choose to create Get Player Character node. I assume what you control is player character. Then drag pin for this node to create new node and choose Disable Movement. As shown at tooltip, it disables movement of character, so even if you press W, the character should stand still.
What I wrote about timing is I suppose you will want to restore ability to move after 2 seconds, so I proposed you a way to restore movement.
If you want to simply try my suggestion, use Get Player Character -> Disable Movement as soon as you overlap trigger.
This blueprint script should be written inside main character which you control, in this case it should work smoothly.