Can the door leading to the roof of a high-rise residential building be locked? Is it in line with fire safety?

According to the fire code, the fire doors of evacuation passages in high-rise buildings cannot be locked for a long time, and can be closed, but they cannot be locked. In case of fire, people can be evacuated smoothly, and the community is generally unlocked. When the fire broke out, the elevator stopped and we had to take the evacuation stairs. Therefore, no one can bear the responsibility for the evacuation and casualties caused by the fire. Especially high-rise buildings.