The first method: there is an unlock button on the display screen. You can find this button and unlock it.

The second method: Some charging piles don't have this unlock button on the screen. You can press the unlock button of the exit button, and sometimes you can unlock the charging piles.

The third method: it is also the most troublesome. If both methods fail, use this method. There is a small hole in the charging gun head, which can be poked with a screwdriver. Be careful at this time, don't be impatient. This will definitely unlock the charging pile.