Dienst ist Dienst und Schnaps ist Schnaps — duty is duty and schnapps is schnapps. Two things, not to be mixed.
Nach Feierabend — after the working day, used as a time of day in its own right.
Urlaubsanspruch — holiday claim. Not an allowance or an entitlement in the soft sense. A claim, in the legal meaning, enforceable.
Abschalten — to switch off. What a German is expected to do at the end of the day, and the metaphor is electrical.