Lid is stuck and will not open after cooking, even though the cooker appears to be off.

How to Fix / Troubleshooting

Safety first: Do not force the lid open. Forcing can cause sudden steam release and burns.

Check float valve position: Ensure the float valve has dropped fully. Gently tap it with a utensil handle to free it if stuck.
Use manual release: Carefully move the steam release valve to Venting to ensure all pressure is released.
Wait and cool: Allow additional time for the cooker to cool; metal parts can bind slightly when hot.
Inspect lock (after opening): Once open and cool, clean the lid lock area and float valve thoroughly.

If the lid remains stuck with no pressure present, the lid lock assembly may be mechanically jammed and require replacement.