When lockdown first started , on our local Facebook group this woman said 'Are there any garages open who could change my car tyre? I'm a keyworker and need my car for my work'.
Cue, a competition of people offering her FREE tyres and repairs as she's a 'key worker'.
That isnt the woman's fault though.
There are contexts where using the phrase is necessary, I would say this is one of them.
The woman needed her car for work, she needed a new tyre and presumably couldn't get to work/do her job without her car so it was a necessary request. Many companies shut down immediately and, in my area at least, that included garages except for a handful that were remaining open for emergency repairs for key workers only.
If you don't know who is open, most people use FB to reach out for personal recommendations etc and to assuage the slew of people saying "it's not a priority" the woman used one phrase "I'm a keyworker" to put her request into the context of a need instead of a want, and the fact it needed to be done asap.
My brother's car needed a couple of minor repairs doing - mostly cosmetic - and he dropped it off to a local garage 2 days before lockdown. He only got his car back yesterday because as soon as lockdown was ordered, the company shut up the garage and staff were not allowed to go into the premises. As his car was not essential for his job (he is wfh) the staff could not make an exception to go in and drive it out for him to collect, despite the fact no work had been started.