Car locks with key but refuses to unlock

I've had my zt for around 9 weeks now finally coming towards the end of fixing all the hidden secrets the car had wrong with it seller most likely was aware of luckily I've spent less than £25 hehe.



Basically the problem I have at moment is the key it locks the car no problem but refuses to open luckily I fixed the immobiliser shortly after purchase so it's just a last resort if the immobiliser battery goes.



The key turns but nothing happens not a sound



Anyone had any similar issues or advice on what might be the cause

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