That is pretty corroded, based on what you have done might be good for a while but I think for convenience I would get another when time allows
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Don’t let a garage do it. 
Some years ago I had a problem with the electronic parking brake switch on my VW Passat. It was a big problem because when it goes wrong, it locks the rear discs and you can’t drive the car! Which is a major pain when you are hour away from home and it’s 9pm. Fortunately the fault was intermittent so a lot of button jabbing got it to work.
I had two different garages (including a VW main dealer) try and replace the switch for me. With the VW dealer, I think they took the old switch out, then got the old and new ones mixed up and put the faulty one back in, and then claimed “the switch is not the problem, it must be something else - we can run some diagnostics for you at £100 an hour”. You can imagine my response.
The second garage (an independent) did basically the same thing - “replaced” the switch but the problem recurred. Eventually the penny dropped and we got a working switch put in.
My current car has an idiot-proof mechanical handbrake.
Yes fitters are not worth the hourly rate charged for engineers but these days they are not mechanics because so much is electrical, they are not engineers because they have a lap top they are Technicians, clueless all the same
Had a problem with my toyota’s keyless entry, mainly drivers side. Cleaned the switch as apparently opening the door when its raining can let water into the switch gear. It was an intermittent fault making it tricky to know if it was cured or not. I have a copy of techstream, toyotas own software that they charge so much to have a technician operate, went through the ECU controls via the lap top and its never gone wrong since
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