I suggest you take legal advice on the issue.
There are two types of these clauses, ones that go too far and aren't enforceable and ones that don't.
I don't know what you do or what you invent, or whether your job is to invent.
However, when it comes to entitlement disputes (that is a dispute between owners/or wannabe owners) between employee and employer the first question we ask is - was it created in the course of employment. Then we ask how it was created - what resources - then we ask if the person was directed to invent that thing etc.
It is not true to say that anything created by employees is automatically owned by their employer. It is more complex than that. We need to look at roles, responsibilities etc.
I would say that in my line of work about 90% of entitlement disputes are caused because the "boss" just wants to use something and thinks it is handy to have - this does not given them entitlement to the invention.
When a clause goes too far, it is seen as a restraint of trade by the Courts and is not enforceable. Employers do not own you or everything you create - just what you create for them in the course of your employment.