Hi @JP68
Welcome to the community!
Your post has been translated as this is a Global forum and all posts/replies must be in English 
I'm afraid if you have forgotten the screen lock for your device you will not be able to reset it, you can remove it but this would also wipe the internal memory of your device.
If you would like to do this, you can perform a software repair using Xperia Companion which will remove the screen lock.
Good luck
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