Green’s Dictionary of Slang

bakery goods n.

[the equation of the anus with an ‘oven’ (although the direct sl. use is restricted to the vagina)]

(US gay) the buttocks, the anus; thus phr. the baker’s is closed, sex is not available.

[US] (ref. to mid-1960s) B. Rodgers Queens’ Vernacular 23: bakery goods (mid ’60s) the buttocks, the anus. [Ibid.] 24: the baker’s is closed adamant statement denying anal approach.
[US]R.O. Scott Gay Sl. Dict. 🌐.