Holding and releasing a key as a response

Hello everyone,
I’m creating a behavioral task using the builder. I’m trying to set up a task where initially a fixation cross appears, and then there’s a sequence of events. What I need is to create a situation where to proceed beyond the fixation cross, the participant has to hold down the space key. Then, if the participant continues to hold down the key, the sequence of events progresses; otherwise, if they release the key, the trial interrupts and moves on to the next one.
Thanks in advance to anyone who tries to help me.

Set up a fixation routine which ends with a key press followed by a trial routine which ends on a key release.

The solution seems okay to me, but there is another intermediate step. Namely, there is a fixation that I need to press to proceed, a stimulus that requires continuously holding down the space bar, and then the target.