I would rather be a DOORKEEPER in the house of my God

It was a real job, English Standard Version 1 Chronicles 9:

19 Shallum the son of Kore, son of Ebiasaph, son of Korah, and his kinsmen of his fathers’ house, the Korahites, were in charge of the work of the service, keepers of the thresholds of the tent, as their fathers had been in charge of the camp of the LORD, keepers of the entrance.

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Among the Levites' jobs, keeping the tent thresholds was one of the lowest because you were not inside but outside of the holy temple. The closer you were to the Holy of Holies, the more important your job would be.

Psalms 84:

10 For a day in your courts is better than a thousand elsewhere. I would rather be a doorkeeper in the house of my God than dwell in the tents of wickedness.

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The contrast was between being outside at the edge of God's house and inside the wicked's house. King David, the psalmist, rather took on the lowly job of guarding the entrance of God's house than enjoying the comfort of being inside the house of the wicked.