Yeah… why bother taking a print screen with that button, if you have camera 
.
Although it would be better to just post the code here in code tags .
Also, this is more like a general scripting question IMHO.
If you need to check something while character is located in trigger area, user trigger stay instead. Because now your OnTriggerEnter will only run in one frame, and you must also be holding the key in that frame, otherwise you might miss the key press.