5 sentences

1. 辞职以后，他一直家居赋闲，闭门不出。

   cí​zhí yǐ​hòu, tā yī​zhí jiā​jū fù​xián, bì​mén bù chū.

   Since resigning, he has been staying at home and not going out.

   Source: Dong Chinese Dictionary

2. 他被这款电子游戏迷住了，整天闭门不出。

   tā bèi zhè kuǎn diàn​zǐ yóu​xì mí​zhu le, zhěng​tiān bì​mén bù chū.

   He is obsessed with this video game and stays indoors all day long.

   Source: Dong Chinese Dictionary

3. 这位老人近年来闭门谢客，不再参与任何社会活动。

   zhè wèi lǎo​rén jìn​nián lái bì​mén xiè kè, bù zài cān​yù rèn​hé shè​huì huó​dòng.

   The old man has declined visitors in recent years and no longer participates in any social activities.

   Source: Dong Chinese Dictionary

4. 委员会正在闭门议事。

   wěi​yuán​huì zhèng​zài bì​mén yì​shì.

   The committee is meeting behind closed doors.

   Source: Dong Chinese Dictionary

5. 他虽然只是一名增生，但依然坚持闭门苦读。

   tā suī​rán zhǐ shì yī míng zēng​shēng, dàn yī​rán jiān​chí bì​mén kǔ​dú.

   Although he was only a supplementary student, he still persisted in studying hard behind closed doors.

   Source: Dong Chinese Dictionary