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If it feels hard, then wait until the pressure settles.

Summary:
Use your finger to snap or flick the side of the can. Turn the can a quarter turn & flick it again. Repeat this six times. Feel for the "pressure" on the container. Slip your finger underneath the soda tab very carefully. Lift up the tab slowly. Wait for any "hisses" to slow down or stop. Open the soda as normal.