Jabir b. 'Abdullah (Allah be pleased with them) reported Allah's Messenger (ﷺ) as saying in the Year of Victory while he was in Mecca: Verily Allah and His Messenger have forbidden the sale of wine, carcass, swine and idols, It was said: Allah's Messenger, you see that the fat of the carcass is used for coating the boats and varnishing the hides and people use it for lighting purposes, whereupon he said: No, it is forbidden, Then Allah's Messenger (ﷺ) said: May Allah the Exalted and Majestic destroy the Jews; when Allah forbade the use of fat of the carcass for them, they melted it, and then sold it and made use of its price (received from it). (Sahih Muslim 1581)
"Say, "I do not find within that which was revealed to me [anything] forbidden to one who would eat it unless it be a dead animal or blood spilled out or the flesh of swine - for indeed, it is impure - or it be [that slaughtered in] disobedience, dedicated to other than Allah. But whoever is forced [by necessity], neither desiring [it] nor transgressing [its limit], then indeed, your Lord is Forgiving and Merciful."" (Quran 6:145)
Selling of Wine, Carcasses, Pig and Idol is Haram along with Animal Fat. I would suggest you to find another job other than this even if the pay is lower.
And the Messenger (peace and blessings of Allaah be upon him) taught us an important principle when he said: “When Allaah forbids a thing, He (also) forbids its price.” (Narrated by Abu Dawood, 3488)
The job you have stated would be against Islamic criteria and be counted as a sin unless it is of the utmost necessity. I highly doubt that McDonalds would accept that you not sell Pork as they can easily find someone else for their job, so that is also likely a bust. Unless you absolutely do not need to, do not accept that job. If you find any Halal Job, accept it no matter how low the pay.
But if this job becomes absolutely must, then you are allowed to take it for the sake of income, but I suggest you look some more. The whole question and wording, make me believe that this is not really a last resort but I can't possibly know. There is always something else, and it is God's job to provide with income or not according to his will, so if he wishes you will easily find a Halal job (In Sha Allah), so pray rather than jump into things.
"And do not say about what your tongues assert of untruth, "This is lawful and this is unlawful," to invent falsehood about Allah. Indeed, those who invent falsehood about Allah will not succeed." (Quran 16:116)0