Electromechanical locks used in a turnstile
Pipe is right: why would you expect us to know? Anyway ...



Figure 1. Turnstile mechanism. Source: AliExpress.

An image search for turnstile mechanism shows up the image in Figure 1. 

Without translating the text it appears to be a bidirectional device. Extending the solenoid on the right will unlatch the pawl allowing the mechanism to rotate left. The blue switch probably unlatches the solenoid so that it re-engages 120° later. The other solenoid allows clockwise rotation.







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 2. Sample turnstile control schematic.


Pressing the RELEASE button momentarily energises the relay.
The first contact latches the relay on.
The second contact turns the solenoid on.
The blue switch, when activated, unlatches the relay which drops out the solenoid.