Does anyone know how to properly end the demonstration collection process in the demo of imitation learning?

[tkdggg]

Isaac Lab documentation->Getting Started->Running Existing Scripts->Imitation Learning
https://isaac-sim.github.io/IsaacLab/source/setup/sample.html#imitation-learning

When i run
"./isaaclab.sh -p source/standalone/workflows/robomimic/collect_demonstrations.py --task Isaac-Lift-Cube-Franka-IK-Rel-v0 --num_envs 1 --num_demos 10 --device keyboard ",
no matter how I operate the keyboard and change the num_demos, the HDF5 file it generates is always only 96 bytes.

I would like to know how to properly end the demonstration collection process.

System Info
-Isaac Sim Version: 4.0
-OS: Ubuntu 20.04
-CUDA: 12.2
-GPU Driver: 535.183.01