I tried to install reCAPTCHA v3 on my wordpress website, now I’m unable to login to the Wordpress editor to edit the site. Every time I try to log in, it displays an error: Invalid site key. I tried to remove the domain and the site and secret keys from the reCAPTCHA admin page but the login problem is still there. I believe I put some code in wordpress... but not sure what and where, maybe it was [recaptcha] in the Contact Form 7 5.1 but I'm not sure (I'm not a developer).
You could try to disable the plugin that added the reCAPTCHA (in this case, Contact Form 7), so you can login again. Then, you can re-enable it and set your site and secret keys properly.
Since you are unable to login, you can't disable the plugin from the WordPress dashboard. Instead you can temporarily move the plugin folder to another location. Navigate to the folder of your WordPress installation → wp-content → plugins and move the contact-form-7 folder.